The gym opened in April and I am a member now. They have all of the modern equipment you need and the breeze from the sea is often as good as A/C. Very friendly staff and no shoes required - no shirt for guys also. There is a juice bar with some alcohol drinks. One of a kind place that fits in.
I think it looks totally cool! We work out every day wherever we are so that is the most original gym I have ever seen! (The gym at Le Guanahani is really nice, too..state of the art!) But not sure barefoot is the way to go in a gym..