I'll be in Argentine a month later. As I know, you can take a flight to Purto Iguazu and spend there 2-3 days to be able to see the falls from Argentinian and Brasilian sides, to visit Itaypu dam project and to make a trip in Christian missions in the jungles.

Another jump you could make is to the lakes area of Bariloche - about 4 days of trips can be barely enough.

A trip of Mendosa area with the highest Andean mount, Aconcagua, can also be made.

Colonia city in Uruguay can be also interesting and you can get there by boat.

Sincerely, Alex Elbert Jerusalem Israel