From Ushuaia the end of the earth..go ski in Bariloche - (May to September)
white water rafting
See if there is any cowboy or cowgirl in you in a estancia a typical argentine farm.
Mount Fitzroy in Los Glaciares National Park , ice climbing toughness.
Mar Del Plata is a spot for getting some sun on the beach if its summer- you can surf around here too.
Iguazu Falls bigger and wider than Niagra Falls this is a great spot to stay and break up the long bus trips. Its an expanse of wonder all that water falling down, how the hell was this formed ?
Buenos Aires is a popular spot to go clubbing, so popular some hostels have integrated clubs and bars. Or have a tango class so that you can remember that you are not in Europe! I'm not sure I will ever forget getting spat on by the visitng fans at a Bocca Juniors game in La Bocca, I think it might finally be out of my hair now :)
Editors note you should first add cold water and leave it 2-3mins to swell the mate. This prevents the pipe getting blocked and also stops you getting boiling tea burns! You add boiling water after that and leave again 2-3 mins.
Had a slight delay at Heathrow, which meant I missed my connecting flight to Buenos Aires (BA) and so was stuck in Sao Paulo for 5 hours.. not to much of a problem as I sat in the Business lounge.. who said this backpacking stuff was supposed to be bad?