Read the following post for more info on Sao Paulo by night:
http://www.flyertalk.com/forum/showthread.php?t=464414
On my last trip to Sao Paulo, I stayed on Av. Paulista and it seemed like every nightclub my taxi took me to was overrun with "garotas de programa"
Of course, you ask a taxi driver to take you to places...what else would you expect?
GRU Lounges - I'm arriving/departing on a Copa Airlines flight in J and also happen to be a NW Platinum and NW Worldclubs member.
AF runs a SkyTeam 24h lounge in GRU. CO, DL, KL, AZ, all use AF lounge in GRU. CM is a member (or about to become) of Sky, you may try to get into the lounge. It is opposite to TAM lounge, in T1. CM also uses T1, which is a Sky Terminal, so I dont think you would have problems to use AF lounge.
I'm almost sure CM uses AF lounge...I think it would be very unfortunate if CM does not have a lounge for its biz pax in GRU considering it operates two daily flights...
Rgs,