On Caye Caulker there's a single motto painted on the walls: go slow. No cars, the streets are sand, and the day is measured by the tides. You leap off the dock into warm, clear water, snorkel the world's second-largest coral reef, and swim alongside nurse sharks and rays at Shark Ray Alley. At sunset, a cold beer with your feet dangling over the Caribbean. That's all. And it's enough.