Back to maps -
I'd continue on 101 south (I love the miles of forest there) and perhaps, if I were you, turn off at Leggett to Fort Bragg and Medocino. But, I've never driven that, so don't trust me. I think I remember people saying that the road 20, which is also an offshoot from 101, takes forever..
depending on your interests and research, you may want to stay on 1 all the way down..
If you cut back from (1) towards 101 from the ocean, via highway 128, you'll eventually get to wine country. I've only taken 128 east of 101, and like it, but that's me.
There are endless websites about the CA wine country, which I like even if it's not a wine tour trip, because I think it is beautiful. I used to stop in Healdsburg regularly because I like Oakville Grocery near the plaza there. Great sandwiches.. it was my ordinary fuel stop.
Here's a link of Sonoma Valley wineries/mention of restaurants, from the Guardian of all places. There's much more to see than Sonoma... Napa.
A comment on that site complains about all the cyclists..
1o1 gets sticky with cars around Santa Rosa at various times of day, if one is driving. There are likely side roads you can escape to with a bike.
Ah, Petaluma is next on 101 after Santa Rosa, and there is a totally gorgeous drive from Petaluma to Point Reyes Station and then to the whole Point Reyes Area... That's Point Reyes Station Petaluma Road.
then to San Francisco via 1..