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rent a street bike from eagle rentals and ride that south.....

then try one of these.

http://www.admotours.com/dirtbike_tours/bolivia_tour/classic_bolivia_tour.html

http://www.ride-chile.com/

http://www.perumotors.com/index.html

This an expensive trip no matter which way you shake this tree. 30 grand would be my guess.