Parque Trianon is the main green pause along Avenida Paulista, laid out in 1892 and still preserving a pocket of Atlantic rainforest in the middle of the city. The paths are shaded and the mood changes quickly from traffic and glass towers to dense trees and birdsong.
It is not a full-day attraction, but it is one of the better short stops in the Paulista area, especially combined with MASP across the avenue.