These programs are great if you love working outside. You can educate visitors about respecting nature or help with trail construction and maintenance. Contact a state park near you to find out what is available. Call a senior citizens center in your neighborhood to see what kinds of opportunities are available. Many senior citizens love to see a young, friendly face and just want someone to chat with.
Some centers even invite young people to come and sing or play games with their residents.
Animal shelters need volunteers to help take care of all their homeless animals and to keep their facilities clean. Teach Join a group that educates young people about important things like safe sex, nutrition, and violence. As a volunteer, you can work to educate your peers about these issues. It also has more information on volunteer opportunities around the country. This site give ideas on how to volunteer as a family.