ADVISORY: The Marin County 1/2 Marathon will take place on October 31st from 7:30am to 1pm.  San Pedro Road will be closed from Main Drive to Back Ranch Meadows kiosk. The north entrance of the park and Back Ranch Meadows kiosk and campground will remain open. Shoreline Trail will also be heavily impacted with foot traffic during that time.  Go to trisignup.com for more information.