Hello,
Here are a list of the places I like the most in São Paulo:
Avanhandava Street; a piece of Italy in São Paulo, I recommend trying out Famiglia Mancini restaurant, they have great food and service.
Skye bar; On top of Hotel Unique; It offers a hypnotic view with a swimming pool and the city as background.
Avenida Paulista is a must, it may get tiring and crowded sometimes but it's worth it, there are a lot of cultural places and museums like Itaú Cultural and São Paulo Arts Museum (MASP) if you choose you can rent a bike to go around.
Municipal market; lots of different foods and appetizers you can try.
Pinacoteca; among the best spaces for art in the city where you can find works of art from Portinari and Anita Malfatti.
Edifício Itália
Ibirapuera Park; a beautiful place with lots of cultural places and museums
Botanic Garden
Pateo do Collegio; where São Paulo was began
25 de Março Street; this is a shopping street, lots of stores with great prices
Catedral da Sé; church that marks the ground zero of the city
São Paulo is a very big place, I may have left something behind, two days just isn't enough is it? But I listed the most important places in my opinion.
Have Fun!