I am planning to travel to south america for a few months in aug/sept. ideally i would like to go to costa rica to do volunteer conservation work for a couple of weeks, chile, argentina, panatanal and end up in brazil for a while. I went to brazil last yr so have an idea as to cost etc but need some advice for the rest.

I know sta travel do tours so i am doing research but would also like some input from ppl who have first hand experience.