Poke around crystal bays and explore undersea life from a sea kayak. Rates run about $110 for a full day in a double kayak. Tours start at $75 for a half day.
Arawak Expeditions. This company uses traditional and sit-on-top kayaks for exploring the waters around St. John on guided tours. Mongoose Juction Shopping Center, North Shore Rd., Cruz Bay, Saint John, 00831. 340/693–8312; 800/238–8687; www.arawakexp.com. From $75 per person.
Crabby's Watersports. Explore Coral Bay Harbor and Hurricane Hole on the eastern end of the island in a sea kayak or on a stand-up paddleboard from Crabby's Watersports. Crabby's also rents snorkel gear, beach chairs, umbrellas, coolers, and floats. Rte. 107, next to Cocoloba shopping center, Coral Bay, Saint John, 00831. 340/714–2415; www.crabbyswatersports.com.
Hidden Reef EcoTours. Coral reefs, mangroves, and lush sea-grass beds filled with marine life are what you can see on Hidden Reef's two- and three-hour, full-day and full-moon kayak tours through Coral Reef National Monument and its environs. Rte. 10, East End, Saint John. 340/513–9613; 877/529–2575; www.kayaksj.com.