Sunny, I just checked out the aerials of that stretch 191. WOW THAT LOOKS FUN, right on.
We have quite a few in Southern California that earn their spot on any decent sized list:
Most famous is Mulholland Drive/Angeles Crest Highway with amazing views of downtown Los Angeles in the background but due to the high population density and road's notoriety ala:
it's more of a circus then anything else on the weekends. Try VERY late night or VERY early morning runs for the most peaceful drive.
I nominate the Nurburgring for the list. And yes, it is considered a public road on specified days!!! Just pay your lap fare and off you go abiding by all typical German motoring laws.
Here's a video of me onboard with a friend getting some pointers to improve my lap time:
https://www.youtube.com/watch?v=eC7F3qL_674
Any tips on embedding the youtube video?