36 and 58 hold the top and runner-up positions on my "greatest roads" list.
I saw CHP on 166 almost every time I did it when I lived in San Luis Obispo, making weekly voyages to the southland. As a thoroughfare between 5 and 101, it was to be expected.
As far as goat trails go, if you ride roads for what they are, rather than what you want it to be, you'll get the most out of them. Most people want paved racetracks, free of imperfections.
On a dirt bike, imperfections make the road. So on Geysers (or the west half of Skaggs, or Knoxville Berryessa), I ride the ol Couch-a-saki like a dirt bike. Standing on the pegs, elbows out, jumping off of berms.
It's a hoot