It's touristic but
Free Walking Tour3
Why locals love it
I live in São Paulo and took the walking tour like 5 times. It's really great. The guides are very nice and welcoming and they give great tips about the city. Also is a great place for meeting new people. I just love it :)
Why you should visit it
You'll know a lot of São Paulo's history, fun facts and curiosities. You'll have a good view of places and can choose on what to do next/later. You'll meet a lot of nice people and make good friends and find company for hanging out.
There're 3 types of tour: Old Downtown, Paulista av and Vila Madalena. Old Downtown is my fav.