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Current COVID-19 Mandates, with no end date (updated 15 Nov 2021)
😷 Masks covering mouth & nose are required for everyone, regardless of vaccination status, in public, indoor spaces, and outdoor spaces where there are 50 or more people.
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Bio-Bay in Fajardo by Kayak – A Sparkling Experience

1/21 BioBay is open, tours are running.

Kayaking in the Bio-BayThere are three bioluminescent bays (bio-bays) in Puerto Rico. One in the SouthWest – "La Parguera", one on Vieques – "Mosquito Bay", and the one in Fajardo – "La Laguna Grande". Out of all three, Mosquito Bay is the brightest, and La Parguera is the least bright. La Laguna Grande in Fajardo is very bright, and it is convenient to do from San Juan and the main island.

What Is It?

A bio bay is a body of water that contains millions of micro-organisms, called “dinoflagellates”, that glow in the dark for a second when agitated. It is a rare, natural wonder that you can easily experience while visiting Puerto Rico. It is best seen on a dark night, try to go when it is moonless or close to it. It also is best on a warm night (summertime is brighter than wintertime, no rain is better than rainy days). But even on a less than ideal night, the bioluminescence will be visible. It is a fragile environment, that can be destroyed by excessive abuse from motor oil, sewerage, sunscreen and bug repellent.

Who To Use?

The usual way most people visit the Fajardo BioBay is on a kayak. There are many kayak operators that guide tours into the bio-bay. They are all similar except for the snacks at the end and the color of their glo-sticks. They all meet at Las Croabas, which is a small bay with a public boat dock. We, and our guests, have used Kayaking Puerto Rico and Las Tortugas in the past – they seem to limit the number of people on their tour and we found them to be very responsive to inquires.

Can I Do It?

We think kayaking is fun and relatively easy. Even if you have never done it before, are out of shape, are young or older – you may want to try it. All the kayak operators provide a mandatory life jacket to wear and will give you a brief “lesson” on how to kayak – and away you go! If you are really bad at it (or just feel uncomfortable) – the group leader usually will help you out. We found the kayaking in the canal isn’t hard except for two places where the canal gets thin, so the current picks up. Some people do go astray and their kayak meets the mangrove bushes, but we didn’t find it to be that big of a problem. We always easily get back on track.

The Details

There are usually 2 trips per night: one right at sundown and one about 8:00-8:30pm. They will ask you get there about 30 mins earlier. Each trip takes about 2.5 hours from start to finish. I like the earlier one because at that time you can still see the iguanas in the trees above you, and it is not so dark on your way through the channel, but it is dark by the time you get to the lagoon.

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All the tours start off near the boat ramp, and then you kayak across the boat marina to a thin channel that leads to the lagoon. You have to go single file to avoid hitting each other and the sides of the channel. The mangrove trees make a canopy over your head, which is low in some spots. But as you get closer to the lagoon, you will notice little sparkles as you dip your paddles into the water.

Once you get through the channel, it opens up to a large lagoon. By now, your paddles leave a swirl of glow behind at each stroke. Your tour guide will gather all of the kayaks on your tour together, explain the bioluminescence phenomenon, and answer questions that you might have.

After spending some time playing with the water making sparkles, the guide leads you back through the channel. You may meet up with another group, but if everyone sticks to the right and it all works out. The guides are all bi-lingual, and knowledgeable about the area, the bio-bay and kayaking. They will answer your questions and may even suggest places for dinner after your workout!

Effective in April 2007, the Puerto Rico Department of Natural Resources no longer allows companies operating tours to swim in the lagoon. Though some rogue operators may allow it, be advised that, if the authorities see you swimming, there can be heavy fines levied against the tour operator.

We went again a few years later re-visited Laguna Grande in Fajardo and were happy to find that the ban on swimming has had a positive effect on the health (brightness) of the bio bay.

What To Wear?

All of the kayak operators use sit-upon ocean kayaks, which means that your butt will get wet – wear a bathing suit or shorts that you don’t mind getting wet. Also, getting in and out of the kayak requires you to walk in the water (usually no more than mid-calf deep), so wear water shoes or go bare foot. There is really no where to change at Las Croabas, so wear shorts that will dry quickly, or be prepared to change in your car afterward. Bring a towel or something dry, so that when you get back to shore, you can dry your bottom off.

Most kayak companies run their tours Monday through Saturday, and give the lagoon the night off on Sunday to rest. Some companies do go out on Sundays.

The public bathrooms near the boat ramp are in bad maintenance, so plan accordingly. If you buy a drink at an area restaurant, you can use their bathrooms.

The minimum age to kayak is 6 years old.

Even if an operator has a web site, we recommend calling. Emails often go unanswered.


Prices vary by operator, but are typically around $48-$68 per person. There is sales tax, which may or may not be included in price.

If you're happy, let them know it — Don't forget to tip your your bartender, tour guide or trip operator if you enjoyed yourself. Gratuities are appreciated and typically aren't included in the price they charge you.

The times for tours vary by operator, but they typically start around sundown, with a second tour around 9:00pm.

Allow at least 2.5 hours for your tour. Check with your tour operator if you’re on a tight schedule.

Kayaking Puerto RicoBook Now Tours Monday through Saturday. (787) 435-1665 or (787) 245-4545. Transportation available.

Pure AdventureBook Now Tours Monday- Saturday. (787) 202-6551 or (787) 314-4347. Transportation available.

Las Tortugas Adventures — Tours Monday through Saturday. (787) 809-0253 or (787) 637-8356

Yokahu Kayak Trips — Tours Monday – Saturday. (787) 604-7375 or (787) 863-5374. Transportation available.

Island Kayaking Adventures — Tours Monday – Saturday.(787) 444-0059. Transportation available.

Peniel Access Eco Tours Bio bay Kayak Trips — They have an adaptive kayak for people in wheelchairs who can kayak. Tours run Sunday- Thursday (yes SUNDAY!). 787-463-1940. Transportation available.

Traveler’s Eco Adventures Bio bay Kayak Trips — Tours run Monday- Saturday. 787-863-2821 or 787- 206-0290. Transportation available.

Glass Bottom PR — Tours run Wednesday- Monday (Yes- a Sunday tour!). Glass bottom kayaks. 1-787-616-9594 or (787) 613- 3928 or email them at ioprecotour@gmail.com . Also known as IO PR Eco-Tours, or The Kayak Rental. Transportation available.

Puerto Rico Bio Bay Tours — Tours run Tuesday- Saturday. (787) 888-2887 or (787) 564-9827. Transportation available.

There are other options for those who cannot kayak:

  • There are now 2 electric motorboat companies that is allowed to take people into the Laguna Grande BioBay. We think this is a great option for older folks, smaller children and handicapped people (or anyone else who doesn’t want to kayak!). Refer to our review of the trip. Space is limited. One operator goes out on Sundays.
  • Las Cabezas Nature Reserve has a night tour. An educational tour that also lets you see and play with the bio-luminescent water without too much physical effort. Reasonably priced, it seems ideal for the elderly, handicapped or people with small children, where kayaking or the trip to the Vieques BioBay is not an option. Only available on Thursday – Saturday. Refer to our review for more information, including hours and pricing.

Los Croabas boat ramp is located at the end of Road 987 in Fajardo.

Los Croabas is about a 45-minute drive from our vacation rental in Rio Grande.

Kayaking in the Bio-Bay

Hay tres bahías bioluminiscentes (bio bahías) en Puerto Rico. Una en el suroeste – "La Parguera", otra en Vieques – "Mosquito Bay" y la de Fajardo – "La Laguna Grande".   De las tres, la Bahía Mosquito es la más brillante y la de la Parguera que es la menos brillante. La Laguna Grande en Fajardo es muy brillante, y es conveniente transportarse allí  desde San Juan y/o desde la isla.


Una bahía bioluminiscente es un cuerpo de agua que contiene millones de micro–organismos, llamados "dinoflagelados", que brillan en la oscuridad por un segundo cuando se agita el agua. Es una maravilla rara que usted puede experimentar durante su visita a Puerto Rico. Se puede apreciar mejor cuando la noche está oscura, trate de ir cuando no haya luna o cuando haya poca luz. También es mejor visitarla durante una noche cálida. Pero de todas maneras, la bioluminiscencia será visible. Se trata de un medio ambiente frágil, que puede ser destruido (al igual que ha pasado con la bahía de La Parguera) por el abuso excesivo de aceite de motor, protector solar y repelente de insectos.


La mayoría de la gente que visita la bahía de Fajardo lo hace en kayak. Hay muchos operadores de excursiones o tours de kayak que van a la bahía bioluminiscente. Todos ellos son similares a excepción de los aperitivos que algunos de estos brindan al final de la visita y al color de sus varitas luminosas. Todos ellos se reúnen en Las Croabas, que es una pequeña bahía que posee un muelle público. Nosotros y nuestros invitados, hemos utilizado los servicios de Kayaking Puerto Rico y de Las Tortugas Adventures en el pasado – que tienden a limitar el número de personas en sus giras y cuyo personal lució dispuesto a contestar nuestras preguntas.


Creemos que el kayak es divertido y relativamente fácil de hacer. Incluso si ustedes nunca lo han hecho antes, están fuera de forma, son jóvenes o personas de edad, hay probabilidad de que desearan tratar de hacerlo. Todos los operadores de kayak suministran un chaleco salvavidas el cual es obligatorio usar y le darán una breve "lección" sobre la forma de hacer kayak – y eso es todo.  Si usted es realmente malo en ello (o simplemente se siente incómodo al hacerlo) – el líder del grupo por lo general le dará una mano. Nos pareció que usar el kayak en el canal no es difícil, con excepción de los dos lugares donde el canal se hace estrecho.  Debido al agite de la corriente,  algunas personas se desvían un poco  y van a parar a  los arbustos de mangle, pero este no es un gran problema. Es relativamente fácil  retornar al grupo.


Por lo general hay dos viajes por la noche: uno al atardecer y otro cerca de las 9:00 pm Cada viaje dura aproximadamente dos horas y media de principio a fin. Me agrada el primer viaje, porque a esa hora todavía se pueden ver las iguanas en los árboles que cruzan por encima de uno, y la travesía no es tan oscura a través del canal, aunque se hace ya de noche cuando se llega a la laguna.

Todas las visitas comienzan cerca de la rampa para botes, y luego se toma el kayak a través de la marina de barcos hasta llegar a un canal estrecho que conduce hacia la laguna. Se debe  ir en una sola fila para evitar golpear a los demás y no chocar con las orillas del canal. Los árboles de mangle forman una especie de arco, bajito en algunos puntos, por encima de las cabezas de las personas, en otros. A medida que se va acercando a la laguna, se dará cuenta poco a poco de los destellos que producirá su remo al moverse en el agua.

Una vez que atraviesa el canal, el mismo se abre a una gran laguna. A estas alturas, notará que sus remos crean un remolino de luz tras cada golpe. Su guía de turismo reunirá todos los kayaks de la gira para explicar el fenómeno de la bioluminiscencia y para responder a preguntas que usted pudiera tener.

Luego de pasar algún tiempo jugueteando con el agua debido a su brillo, el guía los llevará de vuelta nuevamente a través del canal. Usted podría encontrarse con otro grupo, pero si todo el mundo se arrima a la derecha no habrá ningún problema. Los guías son bilingües y conocedores de la zona, la bahía y el kayak. Ellos incluso responderán a sus preguntas y hasta podrían sugerirle algunos lugares para cenar esa noche luego de terminar la excursión.

Hay una ley del Departamento de Recursos Naturales de Puerto Rico que esta en vigor desde abril del 2007 y que prohíbe nadar en la bahía.  A pesar de que algunos operadores deshonestos lo permiten, tenga en cuenta que si las autoridades les sorprenden nadando,  podrían imponer multas contra el operador turístico.

En julio de 2008 volvimos a visitar la Laguna Grande de Fajardo y nos complació mucho el hecho de que la prohibición de la natación ha tenido un efecto positivo en la bioluminiscencia y en la salud general de la laguna.



Todos los operadores usan kayaks de mar, lo que significa que su trasero se va  a mojar – use traje de baño o unos pantalones cortos si no le importa mojarlos. Además, para entrar y salir del kayak se requiere caminar por el agua (por lo general no más de media pierna de profundidad), así que use zapatos de agua o vaya descalzo. En realidad no hay donde cambiarse de ropa en Las Croabas, así que lleve pantalones cortos que se sequen rápidamente, o puede cambiarse de ropa en su automóvil luego  .Traiga una toalla o algún paño seco, de modo que cuando regrese a la orilla, se puede secar.

La mayoría de los operadores ofrecen sus viajes de kayak de lunes a sábado, para así dar a la laguna un descanso el domingo en la noche. Algunos operadores suelen hacer excursiones también los domingos.

Los baños públicos, cerca de la rampa del barco, se encuentran en mal mantenimiento, por lo que debe planificar hacer sus necesidades con antelación.

La edad mínima para hacer kayak es de 6 años de edad.

Algunos operadores de kayak poseen su página de Internet, sin embargo se recomienda llamar por teléfono, ya que el correo electrónico  (e–mails)  no es contestado con regularidad.

El precio varía según el operador, pero suele ser alrededor de $45 por persona.

Si usted estuviese complacido con la excursión déjeselos saber– No se olvide de dar una propina al camarero del bar, a su guía o al operador del viaje, si es que realmente lo disfrutó. Las propinas son apreciadas y por lo general no están incluidas en el precio.

El horario del viaje puede variar dependiendo del operador pero a menudo comienzan en la puesta del sol y hay un segundo viaje alrededor de las 9:00 pm

Calcule por lo menos dos horas y media para el viaje. No se olvide de consultar con su operador turístico si está corto de tiempo o si su horario es limitado.

Kayaking Puerto Rico – Excursiones de lunes a sábado. (787) 435–1665 o (787) 245–4545

Pure Aventure Tours –     (787) 202–6551 o (787) 314–4347

Las Tortugas Adventures – Excursiones de lunes a sábado.(787) 809–0253 o (787) 637–8356

Yokahú Kayak Trips – Excursiones de lunes a sábado (787) 604–7375 o (787) 863–5374

Island Kayaking Adventures – Excursiones de lunes a sábado (787) 444–0059

Traveler’s Eco Adventures Bio Bay Kayak Trips – 787–863–2821 o 787–206–0290

The Kayak Rental  – Van 6 días a la semana, incluyendo los domingos (787) 613–3928

Enchanted Island Eco Tours – (787) 888–2887 o (787) 564–9827

Eco Action Tours – (787) 791–7509 o (787) 640–7385

Hay otras opciones para aquellos que no puedan o quieran hacer kayak:

  • En la actualidad hay dos empresas de lanchas eléctricas a las cuales se les permite llevar pasajeros a la bahía luminiscente de Laguna Grande. Creemos que ésta es una gran opción para personas mayores, niños pequeños y personas con discapacidad (o alguna otra persona que no desee hacer kayak). Puede referirse a nuestra reseña de interesarle hacer esta excursión. Ojo, el espacio es limitado. Hay un operador que hace este tipo de excursión los domingos.
  • La Reserva Natural de las Cabezas de San Juan cuenta con un tour nocturno. Un viaje educativo que también le permitirá ver y jugar con las aguas luminiscentes de la bahía sin mucho esfuerzo físico. Esta excursión es de precio razonable e ideal para las personas mayores, discapacitados o personas con niños pequeños, donde el kayak o el viaje a la bahía de Vieques no es una opción. Sólo está disponible de jueves a sábado. Puede referirse también a nuestra reseña para obtener más información, incluyendo las horas y los precios.

La rampa de partida del barco en Las Croabas, está situada al final de la carretera 987 en Fajardo.

Las Croabas está localizada a unos 45 minutos de nuestra casa de alquiler vacacional en Río Grande.

We are in the process of updating the maps we use on our web site. While we're working on that, you can click on the GPS coordinates below to view the location on Google Maps ...

Activities booked through this page are booked directly with the activity operator. Other than referring you to the activity operator, PuertoRicoDayTrips.com is not involved in the transaction between you and the activity operator. The activity operator is responsible for all aspects of processing bookings for its activities, including cancellations, returns, and any related customer service. PuertoRicoDayTrips.com makes no representations regarding the level of service offered by an activity operator. PuertoRicoDayTrips.com will receive a small referral commission for any activities that you book through this page.

PuertoRicoDayTrips.com assumes no responsibility regarding your safety when participating in the activities described in this article. Please use common sense! If your mother or that little voice in your head tells you that you are about to do something stupid … then don't do it! Read more about Safety →

Comments & Discussion

There are 99 comments on this article.

maybe, but I don't think the companies will want to guarantee they can get you back on time...just in case. I think only 2 companies go out on Sundays, so that limits you. It would depend on the time you get off ship and into the transportation. It is at least 1 hr away from the pier. So if they can get you there for the first tour, then you should be able to get back to ship by 9-10ish. But you would have t work it out with the company.

Comment by Gwenn on 19 Oct 2019

Hello, We will be at the cruise port in San Juan on Sunday Dec 22, 2019 (from 4pm till midnight). Is there a tour that will pick us up at the port and do the Bio Bay tour (4people)?

Comment by melissa carson on 07 Oct 2019

Check our bio-bay calendar ... http://www.puertoricodaytrips.com/biobay-and-moon/

Comment by Ray on 29 Dec 2018

Hi...We will be in PR from the 1st -8th of January, is the bay in Fajardo glowing well now

Comment by Chris Miracle on 26 Dec 2018

Yes, the Fajardo biobay is open and all the kayak companies are offering tours....their infomation is at the bottom of this article. The eletric boats may restart in March....

Comment by Gwenn on 09 Feb 2018

We will be in San Juan on March 2018...are they doing tours of the bioluminescent bay in Fajardo..if so u do we contact

Comment by Rhonda Nunn on 08 Feb 2018

The biobays (at least in Fajardo and Vieques) are still not open for tours. The mangroves were badly damaged, so the Natural Resources dept wants to give the bays time to heal. But yes, once they re-open (hoping by mid Dec for high season) , please come visit PR!

Comment by Gwenn on 15 Nov 2017

Did the recent hurricanes mess with the BioBays or are they still glowing? It seems insensitive to ask, but I didn't know if booking travel would help companies to continue to operate to provide work in a few months or if everyone is still in survival mode of just taking care of their families and cleaning up after the hurricane. Thanks.

Comment by Danyelle McCauley on 03 Oct 2017

I haven't heard from a company lately but we had friends go a few weeks ago and they said it was very good. It has been HOT here, which usually helps the glow.

Comment by Gwenn on 29 Jul 2017

How is the Laguana Bio Bay doing now? We are headed to PR next week and want to book a trip there if it has recovered.

Comment by Corina Rittgers on 27 Jul 2017

It isn't good right now. It never made a full recovery from the full kill off and now with winter (when it is normally less), it isn't glowing much. You can still see th epsarkles, but not like it should be.

Comment by Gwenn on 22 Jan 2017

Do you know the glow status of Laguna Grande? We will be in PR the last weekend of January and we're concerned about the brightness of the bay. Love your website, it's so helpful! Thanks!

Comment by Jenny M on 09 Jan 2017

The sunsets here at 6:23 that day. The tour gets started at 6...but they talk for a bit and by the time you all get in and paddle to the bay, it will be about 7pm. It will be dark

Comment by Gwenn on 28 Aug 2016

We are hoping to join a kayak tour on 9/19. I'm a little uncertain about the best time to go. Your calendar says this is a "best early, good late" day, but the early tours leave around 6 and the sun doesn't set till 6:45. Will we still be able to see much if we embark before the sun has even set? Thanks! Your site has been invaluable in planning our trip!

Comment by Polly on 27 Aug 2016

The water isn't too deep, but it is over your head in places. You are required to wear a life jacket, so that might help relieve some fears. But for most ease of mind, instead of a kayak,go on the electric boat. There is way less chance of tipping that over than a kayak!

Comment by Gwenn on 05 Jun 2016

First of all, I am a 40 something that never learned to swim. Long story, but basically, it was a terrifying out of body experience, I was very young, and I almost died. I want to do this kayaking trip SO badly. It's on my bucket list. I get in water, but I just begin to feel uneasy about deep water. How deep is the water where these tours take place?

Comment by Dana on 03 Jun 2016

Yes, as the weather gets warmer, the organisms grow more rapidly. So I am hoping as summer approaches, the glow will return.

Comment by Gwenn on 21 Apr 2016

I will be traveling there May 24-June 31, I know there is no way of predicting how bright the bay will be however, is it typically worth going to at that time of year?

Comment by Hope on 21 Apr 2016

There really is no way to predict. I assume it will be brighter than it is now, but I couldn't guess how much. Your best bet is to contact one of the kayak operators a few weeks before your trip to get some idea.

Comment by Gwenn on 18 Apr 2016

We are planning on doing the Laguna Grande Bio Bay Kyak tour on June 10th. Do you predict the bioluminescence will be better by then?

Comment by Anita on 13 Apr 2016

I hear the bay is still only glowing at about 20%. You will have to contact the companies directly about whether they can get you from the dock and back in time.

Comment by Gwenn on 05 Apr 2016

hello, we will be arriving in san juan by cruise ship on tues 12th april. we would have to do the early evening tour of the bay. is the fajardo bay glowing well right now? is the transportation to/from the ship reliable? we depart san juan at 11pm. thank you.

Comment by marie on 05 Apr 2016

We just spent 15 days in Puerto Rico and spent one evening at the biobay in Fajardo. We did the later tour, while we did enjoy ourselves it is a real challenge to complete. Aside from the obvious, it being dark and not being able to see a darn thing, the traffic as in the amount of Kayaks trying to navigate through the mangroves was very stressful, then a large electric boat would come through ! The glow was not tremendous but it was glowing and very cool to see. We enjoyed the overall experience and the weather was very good for our excursion but I would not pay again to do this. Too much traffic in the water.

Comment by Michelle Street on 21 Mar 2016

Check the moon calendar before deciding what night to go: http://www.puertoricodaytrips.com/biobay-and-moon/ We love Kayaking PR, but you can check out the reviews of each company on TripAdvisor. A clear kayak would probably be a cool thing, enhancing the trip. I think only The Kayak Rental has them here on the main island.

Comment by Gwenn on 02 Mar 2016

We are thinking of this for early in November of this year, probably the 9th or so. Any recommendations for tour companies?

Comment by Christie on 01 Mar 2016

You will need to contact the tour companies directly. We are not associated with any tour.

Comment by Gwenn on 01 Mar 2016

Do you have space available for this Thursday, March 3? There would be two of us. Either kayak or boat Thank you Lougene

Comment by Lougene McClaflin on 01 Mar 2016

http://www.puertoricodaytrips.com/biobay-and-moon/ The moon will not be an issue any of your dates.

Comment by Gwenn on 17 Feb 2016

I will be going the week of Feb 28 - March 5th which day would you recommend to go on and which tour would be best?

Comment by Sally on 17 Feb 2016

http://www.puertoricodaytrips.com/biobay-and-moon/ All your days are great for viewing. How good it will be depends on how well the bay has improved (it isn't glowing well now, but it is improving). Ask the company you are going with for an idea how good it is.

Comment by Gwenn on 15 Feb 2016

hi we will be in Fajardo from march 7-11. what day would be the best for the bio bay. ?

Comment by vineeta on 15 Feb 2016

Well.... with your nights and the Fajardo bay not glowing well right now, your best bet would be to try to get to Vieques. However, that requires and an overnight stay. AND make sure there is a company that is going out on your nights. Some of them don't go out because it is so bright. It won't be great, so it really may not be worth it. The best night for you might be the 23rd, just bcause the moon rises at like 7:30pm, so it won;t be overhead during a tour (but it is almost 100% bright, so sky will be light no matter what).

Comment by Gwenn on 15 Feb 2016

The kayak companies change the start times based on sunset. So the company will let you know the start time for your tour. At the moment, with Fajardo not glowing as usual and your days, it may be better to go later to have as dark as you can get, for better viewing.

Comment by Gwenn on 15 Feb 2016

You had mentioned in an earlier response that the first trip out in the evening is the better with daylight to see the mangroves and iguanas. Are the nights staying lighter later in late April, and would this still be the best time, or would the 2nd kayak tour be better? We are hoping to do the tour out of Fajardo around April 27th or 28th.

Comment by Kathy Hocevar on 14 Feb 2016

Thank you for posting posting excellent information on Bio-Bay. I'll be in PR from 19th afternoon till 24th noon. Unfortunately full moon is on 22nd Feb and as per bio-bay calendar none of those days are good for viewing bio-bay. I absolutely wanted to see this phenomenon, so can you please recommend best option for me? Also, I wasn't sure whether I should visit Fajardo or make the trip to Vieques. Can you please guide me?

Comment by Shailesh on 14 Feb 2016

Welcome, Fajardo would be your closest bet. It may be improving as the days get longer, we go into drought, and it gets warmer. Check back in March and ask how it is doing. Unless you want to spend the night over on Vieques, Fajardo is your best choice (it is better than Parguera).

Comment by Gwenn on 11 Feb 2016

Great article! Thanks for the information. We will be in Puerto Rico from March 26 - April 1. We are staying southeast near Humacao, but it sounds like the bio bays are not very bright? What would be you suggestion to us?

Comment by Laura Drew on 11 Feb 2016

Check our calendar http://www.puertoricodaytrips.com/biobay-and-moon/ the sky will be dark enough for viewing. However, the bay is not very bright right now due to natural causes, but it is coming back. It is possible by the end of March, it will be getting better. Check with a tour operator a few weeks before to see how the glow is.

Comment by Gwenn on 02 Feb 2016

We will be in San Juan from March 26-28. What are the chances that we could see any bioluminescence in Fajardo at that time?

Comment by Janelle Osteen on 02 Feb 2016

The moon will be great for viewing any of those nights. We always liked the first tour since you can see the mangroves as you go through the channel. But the bay is not glowing very well this winter...maybe 20% of usual. So it will not be a lot to see. I know some companies are offering a reduced rate, and saying the glow is bad but they talk about the bay and the area and other stuff...an "eco" tour where you may see some bioluminescent sparkles.

Comment by Gwenn on 26 Jan 2016

We will be in San Juan Jan 31st to Friday Feb 5th. What night would you recommend we do Bio Bay and do you think the first tour is best then too. Thanks, great page!

Comment by Mary on 25 Jan 2016

From the article- Kayaking- "IO PR Eco-Tours/The Kayak Rental — They go 6 days a week, including Sundays! Glass Bottom Kayaks. 787-616-9594 or (787) 613- 3928 or email them at ioprecotour@gmail.com They can arrange transportation." I believe Baby Bay cruisers does their electric boat on Sundays. You would have to call and check.

Comment by Gwenn on 18 Jan 2016

Thank you for providing this very informative article! We have only a Sunday night to see the bay in Fajardo (at the end of a cruise). Do you know which of the boat tours goes out on Sunday's? Thanks!

Comment by Alan on 14 Jan 2016

Check out http://www.puertoricodaytrips.com/biobay-and-moon/ anything on the 25th on is great. Which bay depends on where you are staying, as the bays you mentioned are about 3 hours apart! If you are staying in SJ or in the NE, the Fajardo bay. If you are staying in the West (north or south), Parguera is the one. Parguera is not usually great viewing as it usually is not too bright (though that may vary) but it is very inexpensive to go see it. So if you are out that way, it is worth it even just for the boat ride!

Comment by Gwenn on 12 Jan 2016

Hi! We will be in PR from April 23 thru 28.. Any suggestions which day , if any, would be best for bio bay tour out of fajardo or la paguera? Gracias!!

Comment by Irene richesson on 12 Jan 2016

From the moon calendar- perfect viewing night any time.

Comment by Gwenn on 11 Jan 2016

The moon will be directly overhead at 8pm...It is only a 2/3 full, but it is overhead- so that is a tough one. I think I would skip it.

Comment by Gwenn on 11 Jan 2016

I was planning on going to Fajardo on Feb 16th 830pm trip. It looks like its a bad moon time. Will it be worth the visit or should we skip it?

Comment by chris on 11 Jan 2016

We will be in San Juan and planning to take the tour on Friday January 29th. What time would you recommend we take the tour? Earlier or later? and does it look like a good night to see the glow?

Comment by Angel on 11 Jan 2016

no, I don;t think so. I think there is a rule 6 and up only. But I guess you can call and ask each operator....maybe they can make exceptions.

Comment by Gwenn on 08 Jan 2016

Hi we have two kids 4.5 and three yrs old. Is there any operator we can use to take them on a kayak? They are used to kayaking! Thanks

Comment by Varun on 08 Jan 2016

They are 2 man kayaks and they usually keep couples and families together.

Comment by Gwenn on 28 Dec 2015

How many people can ride in a kayak? I would like to make sure my husband and I are in the same kayak.

Comment by Tammy Law on 28 Dec 2015

Yes, it is a holiday week, so lots of people want to go. Each company is legally allowed to take only a certain number, so if they are filled up, that is all (they can't just throw another kayak in ). But it might be worth a shot about going and hoping for a cancellation. I am sure it happens all the time. Good luck!

Comment by Gwenn on 28 Dec 2015

Thanks for the quick response! Unfortunately, we tried all the places for Mosquito Bay, and all are booked. I wish we had planned ahead better! If you have any tricks or suggestions of more available options, let us know! We're willing to pay $50-100 on top of the actual tour cost if we can find an option that works before we leave Wednesday afternoon (so tonight or tomorrow night). Also, do you know if showing up there and going on a waiting list for any cancellations ever works, or is that not likely?

Comment by Laura Keefe on 28 Dec 2015

The Vieques biobay is glowing well, but in order to see it, you will need to stay the night there. The fajardo biobay is not glowing well right now. But if you want to see it, going on the 28th or 29th would be better chance of seeing it. We are in a high visitation week, so hopefully you will find spots on the tours

Comment by Gwenn on 27 Dec 2015

We are in San Juan now (December 26) and are hoping to take a kayak tour on the 27th, 28th, or 29th. When is the best time to go, and is Vieques or Fajardo glowing better now? Also, for Vieques, are there tours that take you to the island as part of their package, or must you use the ferry?

Comment by Laura Keefe on 26 Dec 2015

I would go the earlier tour if possible, and on the 19th if possible. The moon rises at about 4pm on the 19th and 5 pm on the 20th, so the first tour will have less light near overhead. Hopefully some of the trees will block some of the light.

Comment by Gwenn on 20 Dec 2015

We will be in San Juan the weekend of Feb 19-21. Full moon is right around that time. Considering doing the kayak tour - given the season and moon phase , any recommendation with respect to f the time of the tour increases the glowing effect since most groups run two tours an evening. Thanks

Comment by Ray peterson on 19 Dec 2015

The fajardo biobay is not glowing well right now. and during Christmas break, it will be full moon, so viewing is even worse. Vieques biobay is glowing well, but would require an overnight stay on that island. It might just not be an option for your large group.

Comment by Gwenn on 01 Dec 2015

Hello, I am heading to PR with a largish family (four adults, four children) over Christmas break. Which area would you recommend in terms of convenience and visibility. We will be staying at Isla Verde.

Comment by Seema on 29 Nov 2015

The visibility is low now due to seaweed. The construction stopped at least 1 1/2 years ago. But, either way, it is not glowing well right now. Around the holidays, tours fill up quickly. There are only 11 companies that are allowed to take people out into the bay (their contact numbers are listed in the article). If you head down to Las Croabas, you may get lucky and find one that has some open spots, from last minute cancellations, but it is a gamble.

Comment by Gwenn on 11 Nov 2015

I read on tripadvisor that Fajardo's visibility is quite poor now due to a construction project. Also, we're trying to make a reservation for a party of two around the end of December, but only found out that many tours are no longer available for those days. I also read online that we could just stop by Fajardo during our visit, there should be a quite a few tour/rental companies on the spot. Could you please verify this? Thank you!

Comment by Rachel on 10 Nov 2015

right now, Laguna Grande is still not glowing well. But you would have to spend the night on Vieques to see their bay. I would wait and not worry about it for another 2-3 months and then ask again. It can change with the winter storms coming, maybe pushing the seaweed away.

Comment by Gwenn on 26 Oct 2015

How is Laguna Grande looking these days? We have one week in Puerto Rico and were thinking we'd go to Vieques, but I am wondering if it would be better to spare ourselves the stress of getting there (we were planning to take the ferry) and choose Laguna Grande instead. On a short vacation, it's nice to spend more time doing things and less time waiting for ferries, but we also are very excited to experience a bioluminescent bay. We are traveling in February and we know that it is hard to predict what will happen between now and then, but since you seem very knowledgeable I was hoping to get your insights.

Comment by Eleanor on 25 Oct 2015

It varies in depth- some areas only a few feet, up to about 12 ft deep or so. You have to wear a life jacket at all times, the kayaks float. But yes, you have more of a chance of tipping a kayak instead of the boat.

Comment by Gwenn on 14 Aug 2015

How deep is the water? I am debating between the kayak and the electric boat option. I cannot swim so wondering if kayaking will increase my anxiety levels if its dark and the water is deep.

Comment by Mae on 11 Aug 2015

We love the Kayaking Puerto Rico people. They really get tourism and making sure everyone has a good experience.

Comment by Gwenn on 13 Jul 2015

The Kayak Rental company has glass bottom kayaks in Fajardo biobay. 787-616-9594 or (787) 613- 3928 or email them at ioprecotour@gmail.com

Comment by Gwenn on 13 Jul 2015

Hello, it's been awhile seen this question has been last asked. Are there now any glass bottom Kayak rentals in Fajardo ? Thanks !

Comment by Valerie Bronson on 12 Jul 2015

Through your experiences do you have any suggestions on the BEST company to go through for the Biobay tour out of Fajardo?

Comment by Jessica on 10 Jul 2015

You will have to contact the tour companies directly.

Comment by Gwenn on 19 Jun 2015

Do you have availability for five people either this Sunday or Monday night? Thank you in advance, Sincerely, Patrick

Comment by Patrick K. Keating on 19 Jun 2015

No- I don't think any would allow 3 in a kayak (there is no 3rd seat). But they will either have one of you go with another odd # person, or go with a guide.

Comment by Gwenn on 30 Jun 2014

I have 5 people in my family......2 adults and 3 children ages 16,14,11. We need a kayak tour that provides kayaks for 3 or 1 being as we are an odd number. I would like to have my 11 year old in the same Kayak as me and my husband. Are there accomodations for 5?

Comment by patricia on 29 Jun 2014

Sadly, the Vieques biobay has been having some serious issues this year, and they are now trying to give it a rest by reducing tours. Hopefully it will recover. So in the mean time, the Fajardo Biobay is your best choice.

Comment by Gwenn on 31 May 2014

A while back I remember reading that the biobay in Vieques was the brightest, the Fajardo biobay second brightest, and the one in La Parguera the least bright. Some time later I read that the Fajardo one had gained health/strength, as was comparable to Vieques. After the recent scare with the one in Fajardo, where do you think it stands now? I will be in PR towards the end of June, and wanted to share the experience with my boys and was trying to gauge the current state of the one in Fajardo vs the extra cost, time, and effort of doing the one in Vieques.

Comment by Josh on 31 May 2014

We did the Fajardo bay in early April with IO tours. There are three key things which will impact your experience: 1. Day: Go on a Sunday when there are only a few tours and you will not bump into other kayaks 2. Moon: Go as close as possible to a new moon 3. Tides: Go for low tides as the glow is better

Comment by RGT18 on 09 Apr 2014

Just to let others know- we did a kayaking tour of Laguna Grande in early March 2014, and we were able to see quite a bit of luminescence. Of course, nothing as bright as the (Photoshopped) photos the tour groups post in their ads, but definitely a notable blue-green glow with movement and lots of sparkles when you splashed water onto yourself or into the kayak. We went during a new moon, which likely helped and I don't think it had rained in the area for at least a few days. It was amazing! Something I will never forget, even though we were unable to take any pictures of it.

Comment by Jen on 08 Mar 2014

Winter time, due to the cooler temps and more frequent rain, there is less visibility. But it should not be "nothing". We talked with our friends who run a tour and their guides rate the bay's brightness after every trip. They have said it is running about 60% of it's brightest summer experience. But according to them, that is totally normal for this time of year. One has to realize that the Fajardo bay sparkles, and people should not expect the electric blue glow as seen on some ads. But it is a shame you didn't get the full effect. It is pretty cool to see. But I will add more detailed info that the effect is less visible in cooler weather. Thanks!

Comment by Gwenn on 12 Jan 2014

we just returned home from PR and wanted to give a review of our experience. We saw NOTHING. When we asked why we were told that the bio bay is mostly seasonal and winter is not the season. What a huge disapointment especially since it was the reason we chose PR for our vacation. It would be helpful to let visitors know that it not noticeable in parts of the year

Comment by mindy on 11 Jan 2014

Just got back from PR and took a last minute BioBay trip after visiting Rio Camuy Caves and Arecibo. We were not organized but we were on that side of the island so decided to head to La Parguera. Paid $8 for a 7:45 launch time....ended up being 8:05 but keep in mind you are on their schedule. There were 18 of us and we went out in a motor boat in the bay where the son of the skipper jumped in "for tips". Unfortunately for him half of the boat went swimming as well, and unfortunately for them this was not a healthy bay at all. The luminescence wasn't all that bright, the water smelled and like others say, you get what you pay for. The operators were nice, but you can tell that this tourist attraction has affected the beauty of this phenomenon. We were back in an hour so if you are in a hurry, well, make your own decision.

Comment by Chriss on 25 Nov 2013

We took a biobay excursion to Laguna Grande with Yokahu. They were really friendly and knowledgable about the bay and the ecosystem. They usually allow children 6 and up, but I definitely would not take a child under 12-14 years. It would be hard or scary for the smaller children to paddle through the dark channel. Once we got to the lagoon, it was amazing. I definitely recommend this to anyone who is going to Puerto Rico. It was very bright and beautiful.

Comment by Jordan on 20 May 2013

Not at this time in Fajardo. There used to be one company, but they no longer do the bio bay. But there is one in Vieques that uses glass bottom kayaks.

Comment by Gwenn on 07 Jan 2013

Do any of the tour operators have glass-bottom kayaks? My sister and brother-in-law went a couple years ago and she said there were definitely operators that had glass-bottom kayaks which would make the experience even better!

Comment by Nick on 06 Jan 2013

Answered a lot of questions. Thanks

Comment by Rachel on 15 Dec 2012

Jericho- PRDayTrips does not sell or book trips. You will need to contact one of the tour operators directly.

Comment by Gwenn on 30 Jul 2012

I will be arriving in Puerto Rico on 7/31/12 and leaving 8/4/12. I will be staying at the InterContinental San Juan. Please send me any details regarding the Biobay Kayak tours during that time. I would like to book 2 tickets as soon as possible. Thanks in advance, Jericho Jamon

Comment by Jericho Jamon on 23 Jul 2012

I have been going to the Bioluminescent bay every 5 years or so for a long time. Since the last time you can tell the decrease in bioluminescence. There are several groups that will take you there either via boat or Kayak (we did the Kayak tour). Unfortunately we reserved late therefore we ended up going with a group called Eco Tour since the others were full.The main guide was a young kid who wanted to make more jokes than provide useful info., and one of his assistants was rude and very disrespectful to my wife. Terrible experience due to the Eco Tour guides, and due to the incredible amount of people going at the same time. The channel to get there is not that big and you have to be getting out of the way of boats and other kayak tours. Still we love kayaks and the bay even though it is not the same. Make sure you go either on Boat or Kayak with the Marine Biologist guide in another group. AVOID ECO ACTION TOURS- not very professionals.

Comment by Fernando on 08 Jun 2012

This was awsome information. You answered all my questions and then some. Thank you!

Comment by Lulu on 29 Feb 2012

I just returned from PR with my teenager. Although I had been to PR dozens of times I had never been to Bio Bay (Fajardo). It was absolutely magical, a must see! We did not kayak, instead we took a small flat bottom boat. The owner, captain, was extremely pleasant and knowledgeable.The boat takes only about 6 passengers. Although those kayaking seemed to be enjoying themselves, by taking the boat we were dry and stayed out longer, The captain also knew where we should look to find iguanas sleeping in trees and other fascinating creatures. Every part of the excursion was incredible, traveling thru the canal felt like a journey thru the amazon, the iridescence of the sea life,and the beautifully starlit night sky was an experience my child and I will always remember. It is not necessary to book this in advance, we decided last minute. The cost was $45 per person.(worth every penny). Unfortunately photos don't capture the experience since it is at night but you'll have a lifetime of great memories!

Comment by Gail on 30 Jan 2011

This is the best information I have found so far. Thanks for the author to write such a great article!

Comment by Guang on 28 Nov 2009

Our experience with Kayaking Puerto Rico was excellent last year. I have been to La Parguera many times, and even though it has been fun to hang out there, I can tell you that looking at "something" in a bucket is not an experience. Laguna Grande was so amazing and Kayaking Puerto Rico such a great service, that kayaking at the bio-bay in Fajardo is the first thing I tell people about when they ask about what to do in Puerto Rico. I had been on a kayak once before, but even if I hadn't, the quick lesson we were given and the great attention by the guys of Kayaking Puerto Rico made it very easy and an enjoyable experience. We felt safe at all times and definitely taken care of. Groups with other companies seemed disorganized and even left people behind!! Our guys were SO nice that they helped them get back to their own groups! Expect to definitely get wet from the waist down at least. Make sure you don't bring any wallets or unnecesary stuff with you. They do have a little box where you can put your car keys and other small items for safeguard, but I had better peace of mind leaving my things in the car (except the car keys of course!). Since the tour is done at nighttime, don't even bring your camera. The glow cannot be photographed and you'll just be worried about getting your camera wet the entire time. At the end, they also take a photo of you coming back to shore... which you can purchase. ABSOLUTELY MUST DO WHILE IN P.R.!

Comment by Ms. T on 25 Nov 2009

Thanks so much Ray!

Comment by Val on 18 Aug 2009

When going to the Fajardo biobay, you not really venturing out into the ocean. You start on the beach and paddle across an area where small boats are moored until you reach the mouth of the channel that goes through the mangroves into the biobay. I believe the channel is only about 5 or 6 feet deep, while the center of the lagoon (biobay) is around 10 or 12 feet deep. You're not paddling in "open water" or doing an "ocean crossing" or anything like that. Actually, it's more like kayaking in a lake than in the ocean (we have done both).

Comment by Ray on 23 Jun 2009

Hi, Thanks for a ton of great info. I just have a quick question. Not having done kayaking before I'm slightly apprehensive of the water level in the biobays. Are they really deep i.e would we venture too far into the ocean? Thanks in advance for the response! Val

Comment by Val on 22 Jun 2009

Thanks for the information. Very well organized. I appreciate it.

Comment by Pat on 18 May 2009

Thanks for your informative, accurate information. My wife and I used it to set up a Fajardo (Laguna Grande) kayak tour with Las Tortugas in early April, 2009, and we found your description spot-on! We've been paddling and diving for decades, and we were blown away by how fun this was. The Las Tortugas group was small, (only 4 boats plus the guide, on the night we went out) the guide was very good, the price was as-advertised, the boats and gear were typical rental quality...and the hyper-bioluminescent location was MAGICAL! Thanks for helping us have this wonderful experience while we visited Puerto Rico. We also enjoyed the radio telescope at Aricebo and the El Yunque rainforest very,very much! This was all a great warm-up for a week diving on the liveaboard dive boat "Nekton Pilot" that departs seasonally from Fajardo on an itinerary that takes divers to the coast of St. Croix.

Comment by Phil Stasik on 21 Apr 2009

This was a really good article. Lots of good information. Appreciate it. Thanks!

Comment by Kruti Desai on 14 Aug 2008

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