Bay Area Ridge Trail: Lomas Cantadas to Skyline is a 11.5 mile out and back trail located near Orinda Village, CA that offers scenic views. The trail is rated as moderate and primarily used for hiking.
Great hike that was done as an out and back that goes through several regional parks including Tilden, Sibley, Huckleberry and Redwood. There are some nice hills and some great views. It's very good to do on a nice, dry winter day or in the spring when everything is green. The only possible downside is you have to cross a few city streets. It can be done in half the distance with 2 cars and there are many other variables you can do along the way...