Flyspur, you may already know this loop, but it's my all time fav in any country:
101 to Santa Rosa
12W to Sebastopol (weird neo-hippie community)
116 N to Jenner on Hwy1 (used to get Red Abs all along there)
N on 1 to Stewarts Pt. (small sharp Rt turn-off)
Skaggs Spring Rd all the way back to Geyserville at 2-3rd gear turns with lot's of grinnin'
Occasionally, I'd see pro-cycle teams training on these roads, and give them a little draft at 25mph for a breather. :)