[imakefrush]

I've lived in Buenos Aires for 3 years and it is obv a must see. Paraguay is a chithole and has little value. Uruguay has good parts. If you haven't hit up better beaches in Brasil, then Punta del Este is a decent beach resort city. A Colonia daytrip from BA is also good fun. I would def recommend Patagonia, or at least Mendoza area, if you have the time.