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I applaud your desire to "give back" through service. These may not be exactly what you are looking for, but it should lead you in the right direction.
Look up the following books to give you some ideas and get you started:
Architecture for Humanity, (2006). Design Like You Give a Damn: Architectural Responses to Humanitarian Crises. New York, NY: Metroplis Books. ISBN – 1-933-04525-6
Bell, Bryan (2003). Good Deeds, Good Design: Community Service Through Architecture. Princeton: Princeton Architectural Press. ISBN: 1-5689-8391-3
Design Corps
http://www.designcorps.org/
Public Architecture
http://www.publicarchitecture.
Architecture For Humanity
http://www.
Architects, Designers, And Planners For Social Responsibility
http://www.adpsr.org/
Habitat For Humanity International
http://www.habitat.org/
Americorps
http://www.americorps.org/
Architects Without Borders
http://www.awb.iohome.net
Mad Housers Inc.
http://www.madhousers.org/
Association For Community Design
http://www.communitydesign.org
Peace Corps
http://www.peacecorps.gov/
Dr. Architecture