St. Barthélemy
it's probably too late for your planning purposes, but IMHO the best food in the Caribbean is on St. Barth. The island itself is small but spectacular, the people are amazingly friendly, no "island" attitude anywhere, the food is mostly flown in from Paris, the chefs are amazing, and it is just the best vacation you could possibly desire. We've been to: Jamaica, Grand Cayman, several Bahamian islands, St. Thomas, St. John, several BVI islands, etc... nothing compares to St. Barth.