PET (Tietê Ecological Park) has an area of 14 million m²: PET was inaugurated on 03/14/1982. The initiative was created with the objective of preserving the Tietê river and some of its floodplains, as well as providing a leisure area for the population of the Metropolitan Region of São Paulo. The core has more than 9 km of trails, gym, picnic areas and barbecue. In addition to a library and a museum that tells the story of the Tietê River. All of these attractions are free. The park also has some paid attractions like: pedalo, bicycle and tricycle rental and train ride.