There are many trails in Mt.Washington, but most popular one is the “Sea View Loop.”
The trail starts at the end of Sea View Ave. After about a half mile, the trail will reach Sea View Dr. Truning right on San Rafael will bring you back to Sea View Avenue again. Total length of the loop is about 1 mile.
From the trail, you can see a glimpse of the ocean (True to the name of the street), Hollywood sign, and Griffith Park Observatory from the trail. It goes aorund 360 degrees near the top of the hill, so that you can see all most anything around Los Angeles. It is a great place to view the sunset, too.