Wow. I wish I was able to do something like this... However, like many others, I've got kids, a wife, school, and more student loan debt (and climbing) than assets at this point... So, I can only live vicariously through others as far as trips like this.
So, the girlfriend is willing to move down to Brazil with you??? Sounds (and looks) like a keeper... On the other hand, you're young and going to Brazil... Maybe not having a girlfriend would be quite advantageous.