There's a vacancy on the Santa Clara County Parks and Recreation Commission, which would be a great place for a good environmentalist to get involved with local government. The announcement's here: http://www.sccgov.org/SCC/docs/SCC%20Public%20Portal/keyboard%20agenda/BOS%20Agenda/2008/May%2020,%202008/KeyboardTransmittal-0011957.PDF
Shortened version of URL here:
While it says the vacant term ends next month, I think that's either a mistake or that a new four-year term starts afterward. The appointment is allocated to Supervisorial District 3 (McHugh), but I'm not sure if the applicant has to be from that district, as opposed to just being appointed by that Supervisor.