Sao Paulo's park bike tours take you through the city's largest green spaces like Ibirapuera and the bigger state parks on the outskirts. Expect a mix of easy pedaling on paved paths, a few hills, and regular stops where the guide explains the history, ecology, and how locals actually use these parks on weekends. Groups are usually small and mixed - some experienced cyclists, some first-timers. The rides last 3-4 hours including breaks. Traffic isn't an issue inside the parks but getting to the meeting point in the city can be chaotic, so plan extra time.
The best time is the cooler, drier months from April to September. Summer (Dec-Mar) is hot, humid, and often rainy, which makes riding unpleasant and the paths slippery. Expect to pay around $35-65 USD per person depending on whether it includes bike rental, water, and a snack. Private tours or ones with better equipment sit at the higher end.
Pick the full-day option that includes a lesser-known park on the edge of the city if you want to escape the crowds; skip the short Ibirapuera-only tours if you're reasonably fit - they're pretty basic and you can easily do that yourself. Bring your own helmet if you're picky about fit, and don't underestimate the sun - even on cloudy days it can cook you.