The beauty of "La Isla Bonita" San Pedro Ambergris Caye is its easy access to Belize City by sea (via San Pedro Belize Express or Ocean Ferry Belize) or by air (via Tropicair or Maya Island Air). When you arrive in Belize City, you will be met by your guides before heading to Actun Tunichil Muknal! You begin your journey with a comfortable drive to the Cayo District ranger outpost.

Gear up and prepare to hike, wade, and swim through the Maya Underworld's trails and rivers.

• Three river crossings and a 30-minute jungle walk bring you to an hourglass entrance on the trail. The cave system extends about three miles from here. Cave features include stalactites, stalagmites, and jarring boulders. And freshwater—streams flowing from ankle to waist depth.

You will hike barefoot through a large cavern the size of a football field after an hour of spelunking. There are Mayan artifacts in the cavern dating back to the 1st century AD including pottery (from intact to completely shattered) tools, ceremonial objects, and even 14 skeletal remains (finger bones, skulls, etc.).

A calcified "Crystal Maiden" is believed to be the skeleton of a young woman sacrificed to the gods in the main chamber.

Duration: 10 hours