I struggled hard to find a single evening I could wear long pants in an entire two week stay. This is one very relaxed place. Most people step off the plane, and struggle for about three days to slow down. It's hot and fragrant and moist, the wind is cooling, and, well, things just don't seem so urgent. You'll walk, rent a golf cart, taxi, or bicycle mostly to get around.
Most people go barefoot or sandals, everywhere.
You can swim in the warm clear Caribbean Sea, protected by the reef. The color is beyond description. Many people just stare at it for hours. The water is really warm, averaging about 82 degrees year round. You'll find pages from resort owners throughout this site, and restaurants too.