Favorite South American Destination???

Hi TEFLers, 

Still in the process of deciding my teaching destination for the second 6 months of next year (July- December, 2013) I was considering South America, however there are so many countries to choose from. Anyone had any wide spread experience in South America; teaching or otherwise? 

Would love to see photos/hear stories etc if possible! 

Cheers everyone! 

• South America