From Bonaire’s small coves to the white sand beneath Saint Lucia’s Pitons, these beaches put the underwater Caribbean within swimming distance of your towel. A mask and snorkel deserve space in your beach bag. Across the Caribbean, you can walk into the sea and find schools of fish, coral gardens and sometimes a sea turtle without booking a boat. That’s the kind of beach we’ve collected here: places where you can spend hours on the sand and explore beneath the surface whenever conditions allow. Some have dive centers beside the water. Others require bringing your own equipment and carryi...