San Ignacio is the best place to start an ATM Cave tour, with less time on the road and more time for the cave. Your guide picks you up at your hotel and drives to the Tapir Mountain Nature Reserve. After a safety talk, you hike a jungle trail with stream crossings, then swim into the cave.
Inside, you wade and climb through limestone passages to chambers where Maya pottery and human remains still lie in place, including the Crystal Maiden. Cameras and phones are not allowed. The cave is wet, dark and physical, and there's no shorter version, so you need to swim and stay calm in tight spaces. Lunch is included. Bring sturdy shoes, socks, a towel and dry clothes. Pick your date and book online.