If you're on outdoor recreation enthusiast, Sep. 27th, Public Lands Day, is probably the BEST day to get out and help your favorite group/club/organization do someting cool for public lands.
If you're in Northern CA, here are three options for you:
Friends of the High Lakes: (several big cleanup teams: http://www.friendsofthehighlakes.com/)
Friends of Eldorado (large teams doing several jobs: http://www.friendsofeldorado.com/)
Friends of the Rubicon (small crew going into Rubicon Springs for construction work). Just email me if you're interested in this one: mailto:firstname.lastname@example.org
National Public Lands Day is a big deal for recreation and we should be out there along with our associates in the anti-motorized crowd. Show the world that you care -- for the great outdoors and do something for Public Lands Day. You can also check out their national web site:
Thanks for being on the team,