Are there any good city tours of Sao Paulo?

I'm going this week and I wondered if it was worth it to try and find a guided city tour (bus, car, walking) or if I should just explore on my own.
Are there any good city tours of Sao Paulo?
go with grayline bus tours for a short day trip *
the (SET} STATE INFORMATION BOOTHS RUA XV DE NOVEMBRO CENTRO
GET THERE FIRST.
GET A TRAVEL GUIDE BEFORE YOUR TRIP OR GET ONE THERE
FROMMERS* FODORS*
GET IT USED ON AMAZON.COM CHEAP
GOOD LUCK..
Are there any good city tours of Sao Paulo?