We stayed on Cooper Island several years ago. We loved it. The best and only place to snorkel is Cistern Rock. It was great and I took a sea kayak and tied up to one of the balls. Great snorkel.

One thing I enjoyed was drifting on an air mattress from the south of cooper Island to the north. It was awesome. always stayed along the resort area and never went past the resort as it was a little rough past the resort.