Me and my friend are gonna go backpacking this summer in South America. We've got about 2 months to see as much as we can, so I figure we can see 15-20 countries (or states) or maybe a little less if some of them are really good. This is also going to be our first time leaving the United States, what type of money do they use down there? We don't really know much about it but we like animals and we wanna see a few zoos with creatures from the Amazon.