Originally Posted by
IaninDC
If you have only a week, I would recommend going to just Buenos Aires and Mendoza. The weather should be relatively moderate and there's plenty to do in both cities, including museums and wine tasting, to keep you busy.
Fully agree with Ianin, the weather in Buenos Aires in May shouldn't be too cold and it's a great city to walk around in and discover some of the museums, and great parks around town. And don't forget the wine and beef!