Tuna Canyon Main Entrance Trail provides access to Big Rock Motorway Trail, Budwood Motorway, Hearst Tank Motorway and Big Rock Lateral in Tuna Canyon Park.
From the PCH, head north on Topanga Canyon Blvd. approx. 4 miles. Turn left (south) onto Fernwood-Pacific, and travel several winding miles up through the community to the ridgeline. Turn left onto Tuna Canyon Road. Travel approx. 1.2 mi. to the dirt pullout that constitutes the trailhead entrance for this lovely park. Note that just south of the park Tuna Canyon Road becomes one-way southbound out to the PCH and can be used to exit the area, but not to travel up to the area from the coast.