If you have one day a month: Reach out to a troubled teen mother. Project Cuddle helps young mothers and rescues abandoned babies. You might take a girl to appointments with her doctor or assist at her baby's birth. Call 888-628-3353 or visit www.projectcuddle.org.
If you have one day a week: Be a mentor. The National Mentoring Partnership will help match you with a child in your area, and once a week you'll spend the day doing just about anything together–from going to a movie to helping with homework. Call 703-224-2200 or visit www.mentoring.org.