Look at this site http://www.peacecorps.gov/
I've been thinking about doing peace corps for a while now. Its for 27 months...the 1st 3 months are for training, basically learning the different language...you need a 4 yr. degree as well, so you wont be doing this right after college. Just look at the site, its pretty informative on whatever questions you have.
no matter how hard you shake and dance, the last few drops go in the pants