just go there if you`re in SP :)
This is a big place with 5 or 6 museums, cafes, and random merchants along the way, selling icecream and water. Restaurants, basketball areas, children yards, Main road is build in a circle around lakes and parks with loads of small passages, Nature is amazing there, it has different places with different kinds of trees, you can rent a bicycle there for 3$R an hour, and make a full circle in park in about 10-15 minutes on it, but if you want to ride a bike i stronly suggest you to come on weekdays, because on weekends there are so many people, that driving it on a speed higher than walking is nearly impossible, so you can leave the bike and do some running there is no better place for it than here in SP. One day i met there Minister of Culture there Gileberto Gil, who was propagandizing for one of candidates for presidents post, hehe.
About museums, there was a museum of some Afro-Brazilian art, some paintings museum, astronomical museum, another painting museum, sorry i dont really remember what kind of paintings it has. and some creatures museum i think this were snakes or spiders, so i definitely did not go there :P
If you`re stuck in SP which is stone jungles, go to Ibira Puera, you`ll love it.