What are your interests? I volunteer at the Houston Humane Society, they can always need help. http://www.houstonhumane.org/volunteer.aspx
Retirement homes are fun. You always remind them of their grandson and get to hear a few interesting stories. Also the pleasure you get from knowing that you distracted them from thinking about imminent death for an hour. Old people are under-appreciated by our youth obsessed culture.
with my job we actually get two PAID volunteer days a year. This Thursday we are going to the Boys and Girls so that should be fun! Plus you have your Big Brothers and Big Sisters that is always good and makes an impact