Old San Pedro Mountain Trail in Pacifica, California

We started biking from here: https://goo.gl/maps/RvvqWC8hPVVSyU5Q7 The Old Pedro Mountain Trail is simply a beautiful trail for hiking or mountain biking with breath taking views of Pacifica, part of the Bay Area and the Pacific Ocean. However, some sections of the trails are steep and difficult to ride on a mountain bike where some sections are very technical with deep and narrow trenches with rocks.