For the past few summers I've been aimless. I held a job here and there, but nothing substantive. I want this summer to be different. Right now I'm thinking about doing some kind of volunteer work in a third world country (teaching English, working with orphans and the poor) or joining Habitats for humanity. If you know of any worthwhile programs/activities specifically, please share.
Edit: Oh yeah, I'm currently a senior in high school.