This wet cave in a remote area off the Mountain Pine Ridge Road offers a canoeing adventure in Xibalba (the Mayan underworld.) You'll float through part of a long underground chamber—the cave is nearly 5 miles (8 km) long. You'll see Mayan ceramics along with ancient calcified skeletal remains and skulls. You can go on a tour from San Ignacio or from your lodge. PACZ Tours, for example, offers a six-hour tour, including lunch and admission to the cave, for BZ$170 plus tax per person, and Chaa Creek offers a half-day tour for two to four persons for BZ$310 plus tax. You can also drive to the cave yourself, rent a boat and gear, and hire a guide from Mike's Place near the cave. There also is a zip line at Mike's Place. Getting to the cave is an adventure in itself, requiring a long drive on very rough roads. Part of the road and the cave itself may be inaccessible after hard rains. Be careful in the cave— one visitor drowned in a boating accident here in 2011. Though more expensive, we recommend you go with a reputable tour company with an experienced tour guide and reliable, well-maintained equipment such as float vests.