Flanked by the world's second longest coral reefs, Belize rewards divers with a rich array of underwater environments ripe for discovery and rich in fish life. Just inside the reef, a string of small coastal islands known as cayes are a short boat ride away from lively spur-and-groove reefs. Offshore atolls add steep walls, schooling fish and the famous Blue Hole. On southern reefs, seasonal fish spawns draw massive whale sharks. Expansive shallows between cayes and the mainland serve as an aquatic playground for kayakers, fishermen and sailors, while the rainforests and mountains of the interior offer Mayan ruins, jungle river drifts, cave tours, off-roading, hiking and more.