Home to the longest barrier reef in the western hemisphere, Belize has long been popular with scuba divers who head to the island of Ambergris Cay to float among the manta rays, turtles, dolphins, and sharks. As of late, however, travelers are heading inland to hike in a rainforest full of parrots and butterflies, visit rarely seen Mayan ruins, and canoe along the Macal River. This is where you’ll find a 365-acre nature preserve in the Cayo district called Chaa …