Old Quarry Loop to the top of Mount Burdell (5.5 miles)
Go through the gate and take the trail right for .4 mile; then go left at Michako Trail. Take the San Carlos Fire Road left to the Old Quarry Trail; here, veer left and up the hill. Head right on the Burdell Mountain Ridge Road to enjoy the well-earned view. Take the Rocky Cobblestone Fire Road downhill to the Middle Burdell Fire Road; turn right. Take the Sand Andreas Fire Road and head left, back to the parking area. Dogs OK on leash.
Hwy 101 to San Marin Dr (west). Right on San Andreas Dr. Park at the end of the road.
In Sonoma County
Bald Mountain, Sugarloaf Ridge State Park; 2,720 feet; 6-mile loop
Get an aerial view of wine country from this accessible peak. Begin from the parking lot on Lower Bald Mountain Trail, and when you come to a fork, stay to the left to remain on the trail and loop from the summit back to the parking lot.