Iguaçu National Park

The easiest way to walk in Brazil's Atlantic Forest, with one of the world's great waterfalls at its center. Created in 1939 and a UNESCO World Natural Heritage Site since 1986, the park draws most of its visitors to the falls walkway, but the forest is the quieter reward. The Poço Preto trail runs about 9 kilometers each way through the Atlantic Forest, on foot in the morning or by bike until midafternoon, and is a good route for birdwatching away from the crowds. Tickets are sold online with a time slot, and the park opens every day. Pair a falls morning with an afternoon on the trails, and expect heat, humidity and busy viewpoints in the middle of the day.