Fish dart, birds sing, and iguanas lounge on the limbs of dense mangrove trees deep within a marine sanctuary on St. Thomas's southeast shore. Learn about the natural history here in a guided kayak-snorkel tour to Patricia Cay or via an inflatable boat tour to Cas Cay for snorkeling and hiking. Both are 2½ hours long. The cost is $75 per person.
Virgin Islands Ecotours. Virgin Islands Ecotours rents its two-person sit-atop ocean kayaks and inflatable boats for self-guided exploring as well as for a three-hour guided tour to historic Hassel Island, which includes a visit to some of the historic forts and military structures on the island, a short hike to a breathtaking vista and swim off a deserted beach. The cost is $89 per person. In addition, many resorts on St. Thomas's East End also rent kayaks. Rte. 32, Estate Nadir, St. Thomas, 00802. 340/779-2155. www.viecotours.com.