Crazy Petes Road 1.9 miles Multi-use Fire road (upper end) Single-track (lower end) Coal Creek Open Space Preserve Midpeninsula Regional Open Space District From the end of paved Alpine Road (3.4 miles east of Portola Valley Road) climb dirt Alpine Road approximately 2 miles to the intersection of Crazy Petes Road. Alternatively, begin at Crazy Petes junction with Skyline Blvd., 2 miles north of Page Mill Road. Agency page Map (Virtual Parks) Mapache Trail (Trail 12) 2.4 miles Hiking Single-track Jasper Ridge Biological Preserve Stanford University Jasper Ridge Biological Preserve From the JRBP gate on Sandhill Road (2 miles west of I-280), drive to the parking area beyond the ranger residence. Take the Causeway Trail to its end (0.5 mile) and bear right. JRBP page Ancient Oaks Trail 1.7 miles Multi-use Single-track Russian Ridge Open Space Preserve Midpeninsula Regional Open Space District Park at Alpine Road pullout, 1 mile west of Skyline Blvd. The trail veers to the northwest just beyond the entrance stile. Agency page Cyberhikes Map (Virtual Parks) Photo (Virtual Parks) Castle Rock Trail 2.7 miles Hiking Single-track Castle Rock State Parks California State Parks From Saratoga, take Hwy 9 to the intersection with Skyline Blvd. and turn left (south). Travel 3 miles to the park entrance. The Castle Rock Trail begins at the entrance kiosk on the south side of the lot. Agency page