I am playing around with the idea of going to South America for 3 weeks this summer. I definitly want to hit Peru, just for a week max. Maybe see the salt lakes and Machu Picchu. After that I want to visit 2 more countries. I know I could spend 3 weeks in Peru but I am not sure if I want to. I would not mind going to Rio De Janeiro and buenos aires. I know the distances are massive between these places. I would be getting flights. I am open to hear about different opinions and advice about a 3 week trip in South America, nothing has been set in stone yet.