Where to book an overwater villa, spend an afternoon in a pool overlooking the Pitons, or go from a beach club to one of the Caribbean’s best streets for dinner. In Negril, you can have dinner by candlelight inside a limestone cave. In Aruba, you can go for a thatched villa over the water on the quiet coast south of Oranjestad. And in Nassau, you can spend the day on a resort’s private island and still go out to a casino or a jazz club after dinner. We’ve covered the Caribbean’s best adults-only all-inclusive resorts, and where you go can make as much difference as where you stay. In Ant...