Tuna Canyon Park preserves 1,255 beautiful acres in the mountains between Topanga and Malibu. Despite being relatively unknown and under-visited, the park delivers some of the grandest ocean views to be found anywhere in the Santa Monica Mountains. From ridges 1,500 feet above a silken Pacific Ocean, Tuna Canyon Park looks east toward Santa Monica Bay and west up the coast of Malibu. There are two main viewpoints in Tuna Canyon Park, found at the ends of Hearst Tank Motorway and Big Rock Lateral. From the main trailhead, it is 1.6 miles round trip to the east-facing viewpoint on Hearst Tank Motorway, and 3.8 miles round trip to the west-facing viewpoint on Big Rock Lateral. Take in both vistas on a combined 5.1 mile hike with 900 feet of elevation change, or really go big and check out a viewpoint on Budwood Motorway for a 6.2-mile expedition.
To get to the main trailhead: Drive 3.3 miles west of Topanga Canyon Road on PCH to Las Flores Canyon Road. Turn north and drive 3.4 miles up Las Flores Road to Rambla Pacifica Street. Turn right, drive 0.6 miles and make another right on Schueren Road. Drive 1.8 miles and turn right on Saddle Peak Road. After 3.2 miles, turn right on Tuna Canyon Road. Proceed one mile to the trailhead on the right at the outside of a bend in the road. The fireroad is obvious but unmarked. Beyond the trailhead Tuna Canyon Road becomes one-way down to PCH and can be used when leaving the park.
More Info at: https://www.hikespeak.com/trails/tuna-canyon-park-malibu-topanga/