Yes, it's easy to get around English-speaking, dollar-accepting Belize. But the good stuff can be harder to find than you think, and sometimes it pays to turn to the experts. Take Island Expeditions' new Maya Reef Explorer trip, which brings you to the rich, remote Glover's Reef Marine Reserve, a World Heritage site 70 miles southeast of the capital, Belize City. From a safari-style base camp, guests sea-kayak the 82-square-mile lagoon in the company of a marine biologist and local guides, hopping from reef to reef (there are more than 700) and poking around sea fans and elkhorn coral in the shallows. After a few days of scoring stellar underwater views, it's off to the Maya ruins of Lamanai and Altun Ha, where you'll play Hiram Bingham in the ancient cities before crashing at an eco-lodge near the Crooked Tree Wildlife Sanctuary (five-day trip, $1,199; islandexpeditions.com).