From a swim ashore on Jost Van Dyke to a boat ride off Guadeloupe, these are the Caribbean beach bars you plan a day around. There’s a point on the approach to White Bay when you can see the Soggy Dollar from the boat. You can see the sand, too, and the short stretch of water between you and your first Painkiller. If you’re swimming in, somebody has to decide what to do with the cash. That’s the kind of beach bar we had in mind here. The one you’ve heard about for years. The one you take a ferry to, or find at the end of a road you’d never otherwise drive. Sometimes the detour is the who...