Volvon Loop Trail is a 4.6 mile lightly trafficked loop trail located near Los Basqueros Reservoir & Watershed, CA that offers scenic views. The trail is rated as moderate and primarily used for hiking, walking, and trail running.
Very nice trail that doesn't get that much use because of location and next to far more used Mount Diablo. Only did this one twice with a few friends. Again, like so many hikes in the bay area, you can combine it with others. The trails from here lead into Mount Diablo as well.