We parked near the beach, in the shade, behind the kiosks and then set up our chairs under the tree at these co-ordinates: 18.312498, -65733846.

Those kiosks were a little scary, though.
The washrooms in the pool hall were also, but they were free.
The beach in this particular location was fairly littered as well and remained that way to the boat launch area to the west.

Eventually, we did stroll eastward to the “actual” beach with the buoys and lifeguard stations.
All-in-all, it turned out to be a pleasant experience for the day … and it certainly wasn’t crowded.