Too bad you asked about north of the Bay Area. I've got two routes through the Peninsula/South Bay area that total about 400 miles of amazing driving with only about 30 miles in common between the two. The hazard is that a lot of them are only one lane in each direction and no passing zones (or even safe places to pass illegally), so an errant slowpoke could rain on your parade -- but the redwoods sure do make for some gorgeous scenery.
Likely selling end of 2015:
11 M3 E92 Le Mans | Black Nov w/ Alum | 6MT | Premium 2 | Convenience | 19" | EDC | Prem Audio | Moonroof | BMW Apps | Yoko AD08 R | Vorshlag Adjustable Camber Plates | StopTech ST-60 380mm BBK | Castrol SRF Fluid | ModMyNav.com rear camera | ECS Tuning Sunglasses Holder