Grand Cayman, Cayman Islands
Get a taste of the island's history at Fort George, which dates from 1790 or plunge 100 feet beneath the waves to view Dayglo-coloured fish, spectacular underwater mountains and elaborate coral formations through the big windows of a submarine. You can get even closer to the marine life snorkelling around Stingray City or meeting the inhabitants of Turtle Farm near the pretty town of Hell, a short drive away from Georgetown and a popular place from which to send postcards. Before your ship leaves, make time to browse George Town's bustling Craft Market and offbeat boutiques. Look out for Caymanite, a brownish-pink semiprecious stone unique to the islands.