Bolivia is an amazing and fun country, and it's really cheap, but on that basis maybe volunteer somewhere thats expensive so you'll be saving money (assuming you are going to travel around a bit as well?)
I havent been to colombia but loads of friends have and didnt have any problems, as long as you stay away from the dodgier areas (the north i believe?)
I'd volunteer in Argentina personally, because I think it's got the perfect climate, and whatever you want (snow, mountains, european style city, remote city) it has it all. But not much beaches!! Anyway, everywhere i've been in south america was amazing so you'll have a great time!! Maybe search for a few different charities/projects and then just choose the one you like the sound of most, and wherever that one is go there!! |