every year in the US they need volunteers for Camp America where basically you go and look after kids that go to summer camp, Chris would probably know more about this than I ,but I did have a friend who went to help with handicapped kids as she had experience with this type of work, she had her air fare paid, all meals, accomodation in the camp and pocket money then she had about three months left on her visa and she toured all over on her own and stayed at YMCA type accomodation [ inc New York and Memphis] and with a Greyhound bus pass, you could find out if this type of working holiday still exists.