I can suggest you tons of beautiful places in Brazil. But you gotta just give me an idea of a route, cuz Brazil is a little big and the places depend on your intentions (entering on north and going south, entering on south and going north, entering on west and going east, etc...).
Coen and Karin have been for a year here and didn't see it all.
If you enter through the north, there is the Serra do Sol near Guyana. Very nice place with some (very) challenging off-road. There are some picrutes here:
http://www.4x4brasil.com.br/forum/showthread.php?t=8530
On the west part of the country, there is the Pantanal, witch is a very beautiful place. Here are some pictures of another traveler that went there during the Panamericana:
https://picasaweb.google.com/gregs.legs/Pantanal#
Bonito is also a very nice place to visit on the west part of the country:
https://picasaweb.google.com/gregs.legs/Bonito#
In the center of the country, there is the Jalapão Desert. Awesome place and very unURBAN (1.2 inhabitants/km²).
There is a video here from when I've been there:
YouTube - Expedição dos Sertões, parte 1: Jalapão
And of course there is the southeast part of the country (I live in Rio de Janeiro), which is nice, but not so unURBAN.
And the list goes on forever. Just let me know about your route so I can help you with some nice spots to visit.