What is the best Caribbean island of beaches, nature, diving and relaxation.?

Everyone seems so nice, it's hard to know what would be my best option.

On St. Thomas has one of the most beautiful beaches in the world called Magen's Bay, a ferry will take you to San Juan trunk Cay it is absolutely beautiful. You can stand ankle water and see the beautiful fish swimming around you, Cayman Islands, would be the best for snorkeling and diving. Caribbean is a good option for everyone.

Cayman Islands Twilight Zone 2007: Extreme SCUBA Diving