Manu National Park

The whole Andes-to-Amazon sweep in one trip. Manu runs from the high Andes, above 4,000 meters, down through cloud forest to lowland rainforest below 400 meters, and its bird list tops 1,000 species, about a tenth of the world's total, with more than 50 hummingbirds among them. The classic route drives down from Cusco on a dirt road, stopping in the cloud forest for the scarlet Andean cock-of-the-rock at its display grounds, then continues by boat from the river port of Atalaya into the lowlands. That makes it slow and committing, several days at the very least on an organized trip, and part of the park is closed to all visitors to protect its forest and the peoples living there in voluntary isolation.