Here are some organizations in and around Austin that are always looking for some help. 

Bunny Run Hill Country Conservancy
Bill Nalle
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327-1122

Austin Parks and Rec

Town Lake Animal Center on Ceasar Chavez
Joanna Johnson

Town Lake Trail Foundation
http://www.townlaketrail.org/

Kids Don't Float
  Program Summary
  Project Diagrams 1
  Project Diagrams 2
Tareka Wheeler
Safe Kids Austin Program Coordinator
Injury Prevention Coordinator Dell Children's Medical Center of Central Texas - Injury Prevention Program
4900 Mueller Blvd.
Austin, TX 78723
Office: (512) 324-0000 ext. 86829
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Save Texas Cemetaries - As a land surveyor one of the interesting things I come across from time to time are cemeteries. I have discovered and mapped lost cemeteries as well as found lost head stones and returned them to their cemetery. There is a non profit group here in Texas called "Save Texas Cemeteries"
This group has taken on the job of documenting and protecting cemeteries across the state. Between Save Texas Cemeteries and the Austin Travis County History Center I have usually found what I need to find. But sometimes the data is just not there.
Well here is an opportunity for an Eagle Project. Documenting and surveying a cemetery. Last year our scouts surprised me with there interest in Genealogy and this a natural progression in that area of interest. As well the scouts were interested in the cemetery clean up at the Bamboo Ranch.
See this link http://www.rootsweb.com/~cemetery/eagle.html