Briones Regional Park – Briones Road Staging Area
From CA-24 take Pleasant Hill Rd north to Taylor north, left on Grayson, right on Reliez Valley to Alhambra Valley Rd, go straight on Alhambra Valley 0.1 mile, left on Briones Rd (there will be a sign that says Not a Through Street), drive 1.5 miles along the narrow winding road to the end, and park along the side of the road.
From CA-4 at Martinez, take Alhambra Avenue south, bear right on Alhambra Valley Rd south, 0.1 mile after sharp right at junction Reliez Valley Rd 0.1 mile west, left on Briones Rd (there will be a sign that says Not a Through Street), drive 1.5 miles along the narrow winding road to the end, and park along the side of the road.