For travelers visiting São Paulo, Guarulhos is just a byword for the airport. The city is home to São Paulo-Guarulhos International Airport, one of the busiest hubs in South America. But this doesn’t do Guarulhos justice. With a population of nearly 1.4 million and 16th-century origins, this metropolis is a worthy destination in its own right. It’s also, despite any lingering industrial associations, remarkably green; the best things to do in Guarulhos include exploring the UNESCO-protected Cantareira State Park, strolling along the Tietê River, and visiting the Bosque Maia Park—not scanning your passport or waiting at the baggage conveyor belt.