The dense Amazon rainforest. The jagged spires of the Andes Mountains. Tropical beaches. Towering waterfalls. With this kind of nature all around, it's no wonder why Central and South America have become nearly synonymous with ecotours. The cloud forests of Costa Rica, the birds and animals of Belize, the otherworldly Amazon rainforest, Ecuador's Galapagos Islands, Argentina's 22,834-foot Mount Aconcagua, Chile's Class V Rio Futaleufu, Mayan ruins hidden in the jungles of Guatemala, Peru's Machu Picchu... There is an endless variety of things to see and do in Central and South America.