You ever get a chance to visit St Croix in the US Virgin Islands, make sure you snorkel the cruise ship pier in Fredricksted (when there are no cruise ships in, of course haha).
This video is a small preview of what awaits you on what was a hour plus snorkel for us. The biggest attraction was the variety of types and colors of sponges on each pole, but you will also see turtles, rays, fish, etc. It is truly amazing!!!!!