If you want a nice relaxing beach day, then Rum Point is it. The water there is beautiful, beach is also nice, not large and you can even snorkel if you with. They do sell food/drinks there as well, it is a nice excersion, been there twice now.
i got engaged at Rum Point . My favorite place in the world. Been there twice. You do have to drive there and you drive on the left so be careful. Last time we were there we saw an awful accident . It is about a half hr drive from where the boats tender . Have Fun !!