Leave San Ignacio in the morning to start your day tour with the drive toward Belmopan and the scenic Hummingbird Highway, crossing the green mountains while passing by orange orchards, pineapple plantations, and rainforest-draped valleys along the way. Your destination is Blue Hole National Park, a protected and accessible area managed by the Belize Audubon Society. It's also home to Crystal Cave, known locally as Mountain Cow Cave, an otherworldly natural wonder located deep in the jungle in the heart of the park.

After a 50-minute hike through the tropical forest with your guide, you'll reach the entry point where you'll rappel 15 feet (4.5 meters) into the vast entrance of the cave. Traverse its large chambers, sliding down mud ramps and scrambling along rocks. This is a challenging descent into Xibalba, what the Maya believed was the realms of the underworld. Your guide shows you the shimmering formations in the cave, along with artifacts and skeletal remains of sacrificial victims from ancient Maya ceremonies. This tour is physically demanding but well worth the effort to walk in the footsteps of Maya ritual leaders and see the evidence of their sacred rites with your own eyes. After your cave exploration, refuel with a hearty homemade lunch and soft drinks, and take a swim in the cool waters of the Blue Hole, a deep sinkhole filled with rain and spring water, known as a cenote. Your tour then ends with return to San Ignacio.