I, of course, photograph everything on Fuji 400 film. Don't forget extra batteries, film supplies are expensive. I don't use filters but if you do this is a great place to implement them, especially any polarizing filters you may have. Check out all the beaches. I hope you don't blush easily.
Most beaches are topless and many are clothes optional.
The Caribbean Islands have two distinct sides and both are well worth photographing. There's the Atlantic side of the Island, and the Caribbean side of the island. Photograph the difference. Shoot the waves crashing into its rocky cliffs on the Atlantic side and the calm sandy beaches of the Caribbean side. Remember all roads lead somewhere, so take them.