Best SoCal driving roads?

[yarswiss]

I've been taking my Yaris out on mountainous and hilly single-lane roads to see what it's capable of. I'm amazed how well it does at speed on the Angeles Crest and smaller areas like Little and Big Tujunga Canyons roads. I'm well aware I don't have a rally car, but I want someplace with little traffic where I can have some fun.

I live around the Sunland area, and I'm looking for something local and not a closed circuit, so if anyone knows of any really good, curvy, steep mountain roads, do tell!