There is a new accelerator for startups that want to enter the Brazilian market. The first part of the program would take place in Silicon Valley/San Fran, the second part in Sao Paulo.
The accelerator is for internet-based businesses from, well, anywhere: Brazil, America, doesn’t matter. It seems like companies would receive fairly intense assistance, which I think is a good idea, given the challenges of doing business in Brazil.
Even if you are not accepted into the accelerator program, there may be co-working space available in the Valley/San Fran and perhaps in Sao Paulo. This would be good for learning, networking, etc.
If you have an interest, they have a signup page here.