I just got back from Argentina - where I lived for a year. I fished primarily around Bariloche area - unfortunately, I didn't make it down to El Calafate. If you head north and want info on the Pichi Leufi, Limay, Traful -- let me know.
You're going to see some amazing country.
Hope you like steak - best in the world

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I still have a bunch of friends down there -- so let me know if you need anything - info. or otherwise, I'd be glad to help out.
Do you have any time in Buenos Aires?
MJ