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If you are staying on the south part of the island (from about the Reef Club Resort south), another option is to run along the beach. The beach extends several miles, and you can stop at some of the resorts/bars if you need a break. However, the sand is very fine, and running can be a chore (almost like running in snow). You'll probably find you need to run right at the water line to get at least some firm footing. There is a slope, so it can be hard of the legs (run both ways, so each leg gets the same stress).