World Horizons International: Summer Programs with a Purpose – http://worldhorizonsusa.org
If you are a high school student interested in making a serious contribution to a community in need of volunteer support, think about joining World Horizons International this summer. You’ll be working hand in hand with local people in a cultural framework that may be very different from your own. If you are willing to learn and up to the challenge of a true cross-cultural experience, you will be richly rewarded. There is no “typical” World Horizons volunteer. Participants come from a variety of geographic locations throughout the world. They represent different ethnic, religious and socioeconomic backgrounds. What they share is a sense of adventure, a willingness to compromise when necessary and the desire to help others.
Athenian Community Service Blog 