SANDWICHED between Mexico and Guatemala, English-speaking Belize boasts more than two million acres of forest, 180 miles of pristine Caribbean coastline, and dozens of innovative eco-lodges. Two of the best? The Hamanasi Resort has treehouse bungalows on a 12-mile stretch of beach minutes from 100-foot waterfalls. The soundtrack is chachalaca birds calling raucously, and daily activities include tracking jaguar prints in the Cockscomb Basin Wildlife Sanctuary, ringed by the Maya Mountains. For diving, head to Francis Ford Coppola’s posh Turtle Inn, where the Mesoamerican Barrier Reef—the largest in the Western Hemisphere—is just offshore. From April to June, you’ll dive with migrating whale sharks, which come to feed on coral spawn during the full moon.