The pet-friendly Mount Tamalpais State Park in Mill Valley, CA welcomes leashed dogs on paved roads, parking lots, campsites and picnic areas. Dogs are only allowed in these areas. The State Park consists of deep canyons, sweeping hillsides, cool redwood forests, oak woodlands, and open grasslands. At night, Fido must sleep in a tent or vehicle. There's no main entrance fee; however certain trailheads have cash only parking fees. Visit Website

Or call (415) 388-2070 for more information.