Santiago Peak (Orange County highpoint)
None dare call it cheating, but I drove part of the way to the highest point in Orange County.
I started out in the small rural town of Silverado (east of Tustin, if that means anything to you) and drove up Maple Springs Road. I could and should have biked it, but I drove it. After the town ends it turns into rough pavement, and then after that it turns into a much rougher dirt road with plenty of big dips and twists. I was in first gear through much of that. It gets better after a while, and then intersects with the Main Divide Road.