So yeah. Arriving into GRU from MIA around 7:00 and leaving for MVD around 2200. Looking for things to do while in Terminals 2 and 3. Where can I take a shower? Will I be able to get a day pass for a lounge (inbound AA/ outbound TAM)? Any and all tips are appreciated.

Full disclosure: I do have a visa for Brazil but I'm trying to conserve my costs and not actually leave the airport.