ok so here goes, i am going to visit a friend in chile and while i'm down ther we wanted to go on a little adventure to argentina and brazil. the places i really want to see are buenos aires, iguazu falls, rio de janeiro, and sao paolo. I am trying to go the most economic way possible but i will only be down there for 3 weeks so i dont want to spend too much time getting from one place to the other. i would like to go by bus or train because airfare is super expensive. if any one knows any specific bus or train companies that go from any of these cities, how much it costs or how long it takes it would really help me out so i can start planning. basically any information or websites that may help would be greatly appreciated! thnk you!