As an avid hiker on Mount Diablo, I am often asked for local hiking information. Here, I will share some of my experiences as I mostly follow hikes described in the Hiker's Guide to Mount Diablo and will refer to it. I am working my through the 50 hikes described in that book. http://www.mdia.org/site/online-store/books-print/product/119-hiker-s-guide-to-mount-diablo-state-park