This geocache is in EBMUD lands. You'll need an EBMUD hiking permit to walk in this area, and these are easy to get, it will take you just a couple minutes online. Go here to do that: https://www.ebmud.com/recreation/buy-trail-permit/
Start the geocache quest in the Tilden Park Inspiration Point parking lot, head north from the Inspiration point trail near restrooms to the EBMUD lands gate.
This and the other geocaches in this series take you on a scenic tour along a ridge above San Pablo reservoir. This is quite scenic particularly in spring. The first quarter mile of the EBMUD trail is muddy in rainy season (now). The rest of the trail is in decent condition with a few smaller muddy spots.
Scraggly tree, 4 feet up. Pill bottle, push and twist to open.