Personally I don't know why people flock to these roads like Palomar and the Gap. I'd avoid them like the plague. Great places if you are going to be "seen", but if you just want to ride, no thanks, I'll find a back road with no traffic. Last thing I want when I do some spirited riding is to have anyone but a couple of friends around me... or maybe just one friend with a cell phone.
Bottom line is, if you want to go fast, to test your skill, do it on a track. Yeah, you'll get passed by people, yeah you'll be nothing special when you are there. But you'll learn more about yourself and your bike than you will on any public road in the world.