Sian Ka’an Coastal Reserve, Mexico

Once you hop in a boat at Muyil, Mayan-dug canals through sprawling tracts mangroves are at your fingertips. Though this reserve is home to plenty of crocs, the canal waters are crystal clear, and most tours climax in a current-driven, boatless free-float. Look for dolphins and sea turtles amongst the mangroves, but don’t expect to set eyes…