National Public Lands Day is the nation’s largest, single-day volunteer event for public lands in the United States. It began in 1994 with three sites and 700 volunteers. In 2010 170,000 volunteers worked at over 2,080 sites in every state, the District of Columbia and in many U.S. territories. Volunteers collect trash, remove invasive plants, build and maintain trails and do plantings. To learn more go to: NATIONAL PUBLIC LANDS DAY.
Northern California ways to take part:
Natural History Wanderings 
I clicked on the Golden Gate link and got: Forbidden
You don’t have permission to access /pore/http:/www.parksconservancy.org/calendar/volunteer-events/special-events/national-public-lands-day.html/volunteer_hrp.htm on this server.
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By: John on September 21, 2011
at 11:36 AM
Thanks John. I have corrected it and it should be fine now.
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By: Sandy Steinman on September 21, 2011
at 12:43 PM