There is one at the far right hand of Son Bou beach, as if you are heading towards Santo Thomas on foot. Its set in a lovley bay part of the beach. We used to go here when I lived in Santo Thomas as myself and my colleagues knew we would not get disturbed on our days off by our guests!! There is also one in Santo Thomas which is off the beaten track, past the restuarant as you enter the resort. I have not actually been to this one, just the one in Son Bou. These are the only 2 I know of but I am sure there must be more!