When a Tobago divemaster tells you to “go with the flow,” take it literally. The Guyana Current bathes the eastern coast of the island in nutrient-rich waters than support magnificent growths of soft corals, and create seasonal gatherings of hammerheads and manta rays. Currents can run from mild to wild, but there's no danger, as dive operators well versed in the techniques of drift diving select itineraries based on each diver's comfort and skill levels. More tranquil waters along the island's western shore offer shallow reefs and a fish-laden wreck. Any trip to the island should also include a visit to the forests and waterfalls of the Western Hemisphere's oldest nature reserve.