Really nice choice. If you pretend to visit Interlagos, I recommend to reserve some time to go to Sid Special Paint. Sid Mosca was the artist responsible for Senna's helmet livery.You can visit the store eat this address:
Endereço: Av. Washington Luis, 895
São Paulo – SP – Brasil
Fone: (11) 5687-8079 | (11) 5548-2094
You can set the address in you GPS. It's really close to Interlagos track. Reserve some money...LOL If you are a real fan, you will spend a lot of money there...
I am from Sao Paulo but i'm living in Rio now. So, I use to visit my parents there. When do you pretend to visit Sao Paulo? If we had a chance to be there at same time, I can help you there. Keep in mind that Sao Paulo isn't a safe place, specially for foreign people. Don't hesite to send me a message if you need help.