I'm lucky to live so close to Las Trampas Regional Wilderness and its 4,636 acres of open space. Once you are there, you really feel like you are far removed from the urban hustle and bustle just a few miles away. There are several entrances to the park, but my favorite is at the end of Bollinger Canyon Road in San Ramon. And my favorite hike is along the stunningly scenic Las Trampas Ridge.
Luckily for me, the older Z gets, the more he likes to hike, and since I don't hike by myself anymore, he makes a great companion - although he does tend to hike at a much brisker pace than I do; hey, I do have to keep an eye out for photo ops and stop frequently to take advantage of them, right? That slows me down a bit! Now put on your hiking boots and let's go. This one only takes 1.5 hours...
If you go here, be sure to take the Mahogany Trail off of the Las Trampas Ridge Trail. It goes through particularly pretty terrain.