I started at the Alvarado Park parking lot, hiked up to the Wildcat Creek Trail, turned left onto the Havey Canyon Trail, continued up to the San Pablo Ridge Trail, Bel Gum Trail and completed the loop at the Wildcat Creek Trail where I started. Total distance was 6.7 miles with elevation of 1,125 feet. There was quite muddy at the Havey Canyon Trail but I had a good workout.
Wow, superseded my expectations! We missed the trail we had planned so took a longer one - Wildcat Canyon, Belgum, Nimitz, Curran, Wildcat George, Curran, slight deviation to Lake Anza, back to Wildcat George, and took Lone Oak back to Wildcat Canyon. It was a 15 mile loop with few hills and beautiful with creeks, reservoir, views of East Bay, cows, and wild turkeys. Best trails of them all were Curran and Wildcat George. Not crowded with many parking lots. Cell phone also works the entire time :). I would return and explore many other routes.
Spectacular views of the San Francisco Bay and San Pablo Reservoir. Lots of wildlife - coyotes, turkeys, cows. Ran the loop after it rained so pretty muddy but trails are very maintained and easy to navigate. Definitely some good inclines but the views are worth it and always fun to watch the cows. Make sure the cattle gates lock when you walk through. Also be mindful as you cross a couple of streams. Parking fills up fast on weekends.