There's a little valley just over the hill to the north that is totally undeveloped. I used to access it from Larga Vista Dr. near Union and Blossom Hill. It belongs to the University of California.
It's now the Heintz Open Space preserve (ick). At that time it was only partially overgrown. Under the management of MidPen, I'll bet it's a lot thicker now.
When was the last time you went there? I accessed it from Regent, but I only had time to go up the side trail, so I don’t know it to well.