Replying to NSers Where Should I volunteer?

Bolivia teaching kids English, basketball and building homes
Peru teaching English and helping sick children
Peru walking large cats


This summer I am volunteering in one of these countries, this thread is for opinions on where I should volunteering, not debating the economic situations of these countries or something.  Each place is the same length, about 2 weeks (due to air travel layover they are 15 days, but 14 in the country)

So NSers, which one should I do?