After 2 months of studying abroad in Buenos Aires, I plan to travel from Buenos Aires, through Bolivia, and eventually to Lima, Peru. The catch is, I have only 2 weeks to see as much as possible on the way.
I need advice; where to go, how to get there, etc.?
Buenos Aires - Lima in two weeks? Madness, but it can be done. You can't stray off the route because you won't have time, but there's a couple of nice stops you can make along the way. I'd do the following:
Buenos Aires - Salta - Tarija - Potosí - Sucre - Cochabamba - La Paz - Copacabana - Arequipa - Nasca - Lima.
All legs can be done in one go and under 24 hours, given that you don't run into unexpected road blocks or other trouble. If this seems too dense for you (I wouldn't be surprised), you can skip the bit between Tarija and La Paz, and travel (slightly) more direct via Uyuni and Oruro.
Fly from BA to Salta first.
I would focus on Salta and surroundings (4 days or so).
Than bus to La Quiaca and onwards to Tupiza and a 4 day tour in the southwest of Bolivia.
After arriving in Uyuni you only have around 4 days left, but I would choose to travel as fast as possible overland via La Paz to Cuzco and spend several days over there (including a daytrip to Machu Picchu if you want).
Otherwise skip a day or so in and near Salta and add that to Cuzco and surroundings.
This way you focus on 2-3 areas, have some travel overland and two flights (BA-Salta, and Cuzco-Lima). Otherwise, it is impossible.
I'd like to tackle your question with a slightly different answer than the very good solutions Utrecht and bentivogli provide. Ok, so you have two weeks. And you want to see a lot of things. Fair enough. Have you considered spending more time in fewer places and less time studying the interior of all the buses you'll need to take to get across the very wide expanses of South American continent you propose to visit? Can you take a moment to think about what do you REALLY want to experience, and not just see. You seem to have two areas of focus:
- The beautiful Bolivian altiplano and the Salar de Uyuni? If so, getting there and spening time in San Pedro de Atacamba, the 4-day salar trek, and some time in Potosi and La Paz could easily occupy all your time with much less bus travel.
- or, do you want to visit Inca ruins in Peru. There is much to see in and around Cuzco including Machu Picchu itself. This tour could include Arequipa, Nasca and Copacabana as well.
It's a different way of thinking about your two weeks, but you may enjoy yourself more, even though you see less, by giving fewer areas more attention. Just trying to offer another point of view. Good luck!