The National Youth Sports Program, administered by the NCAA and funded by a federal grant, introduces lacrosse to low-income children in Philadelphia. The camp, held at Temple University, offers instruction in 13 activities, and almost all of the children are seeing the inside of a college campus for the first time. (MLW)

This guide to more than 1,000 summer programs for teenagers encompasses recreational and academic programs sponsored by colleges, universities, independent schools, foundations, museums, nonprofit organizations, and for-profit businesses. Every program listed accepts students age 13-18; some programs also accept participants older or younger.…