I believe I took that route once several years ago. My girlfriend at the time's father lived outside Mendocino in a town name Comptche, we used to go exploring up there quite a bit... Man those were some good times, it is truly beautiful country up there.when you are going up Hwy 1 (not 101) and you go through Gualala, where my father used to live, keep going to just past Point Arena, but before Manchester, and turn right on Mountain View Rd towards Booneville. When you get there take a short right on 128 then a left on 253 towards Ukiah. I don't know if there is anything in Ukiah if they are not having some kind of festival but the ride there is gorgeous. It is far better than Tail of the Dragon in the Smokies. Single lane road with tight turns and switchbacks in beautiful scenery. If you get nauseous easily take a bag and mouthwash.
I'm impressed. I know those roads. I would need at least three days for that trip. And that would be pushing it for me.I used to live in Sonoma, I am from Huntington Beach, my mom lives in Olympia. I've done this trip many times, twice in December!
Here's how ya do it in two days my friend!
Los Angeles to Santa Rosa (100 mi North of San Francisco) along the 101 is about 9 hrs
King City (Lunch)
Santa Rosa, last stop, dinner & gas (Get a cheap hotel here for about $50 or a really good hotel in Windsor).
From Santa Rosa To Seattle is one day too (7 hours) along the 101 & the 5 FWY
Grants Pass, Lunch(get on the 5 here)
See? It's not that hard. I do it on my Dyna every two months or so. I even broke in a fresh motor on this run last year. Only Grant's pass is hairy in fall with early snow, and of course the bay Area fog is ALWAYS there.
Good Luck Bro!