Guests at Mexico’s Cañón del Sumidero Ecotourism Park outside Tuxtla Guitiérrez, Chiapas, are in for a wild ride. Visitors are whisked by speedboat through the alligator-laden Grijalva River, which cuts a 21-mile fissure through 3,280-foot vertical cliffs. Once inside, the park is home to the longest zip line in Mexico. The five-stage, 2,700-foot ride offers jaw-dropping views over the park’s 487-acre jungly landscapes. www.sumidero.com