This preserve holds some of the mightiest valley oaks in Marin. There are also impressive coast live oaks, black oaks, and blue oaks. Start at the gate at the end of San Andreas Drive, heading out on San Andreas Fire Road. Turn right onto Middle Burdell Fire Road, passing the seasonal vernal pool called Hidden Lake. After crossing Old Quarry Trail, take a sharp right at the second junction, on to Salt Lick Fire Road, where hillsides above the grasslands are dotted with valley oaks. Follow to the junction where it joins San Carlos Fire Road, which loops right onto San Marin Fire Road, heading back past the water tanks to where you started on San Andreas.
- 4.5 miles
- 700 foot elevation gain
- Strenuous