Hey folk, my wife and I are looking to spend about 3 weeks down in South America for a first visit, and would like to bounce around a little - maybe Chile, Argentina & Brazil. My questions are 1) Is March or April an O.K. time (weather) to visit? Is one month better than the other? and 2) what is the best gateway to fly in/out of in that area? Should we try to fly in to one and out of another, or roundtrip it in/out of one city?

Thanks much, Ken.