Jacarepaguá is a huge, rapidly evolving suburb encompassing rural areas and busy avenues lined with high-rises. Hiking trails cut through dense Atlantic rainforest in Parque Estadual da Pedra Branca, home to tree frogs, boa constrictors, and hundreds of bird species, plus waterfalls, swimming holes, and panoramic lookouts. Nearby, a tennis center and an indoor velodrome are among venues built for the 2016 Olympics.