was in sth america last sept for 3 weeks, 8 days of which we were in argentina. was 4 nights in BA, 3 in El Calafate/El Chalten and 1 night in Iguazu.
Was'nt mad on BA, not the city I imagined it would be. So I wish I'd spent less time there and more in Calafate and especially El Chalten which has some amazing national parks and walks. The glaciers down there are spectacular. We were there in mid -sept which was the end of winter- weather was cold but easy to walk in and there was so few people about, we had whole parks to ourselves.
Iguazu I'd give a miss to, unless your really into waterfalls. It's a long way from anywhere and while the falls are spectacular, there are so many tourists there