I'd add Lassen National Park and Hwy. 70 from Oroville to Quincy. Susanville is sort of cool too, but watch out for all the CHP there. Mill Creek south of Lassen has a small housekeeping cabin rental thing operated out of their restaurant post-office that was reasonable at $55 per night. We rented a furnished cabin in Mineral for a few nights and it was nice. The mini-market there has info on the contact owners for them. They live in Mineral and just down the street from their 2-story rental cabin.
If you hit Reno, I'd check out the BMW dealer in Sparks too. They got a lot of cool stuff, BMW and not. Say "Hi" to Suzette too (owner's wife) and ask her about the latest BMW clothing. She gets a lot of advanced stuff and they ask for her feedback. They sell a lot of it there.
You could - if you're daring - take a tour of The World Famous Mustang Ranch in Patrick, NV just outside of Sparks, NV and take a tour of the place with a real state-licensed hooker for free. Then you could attempt to flee across the parking lot to The Wild Horse and eat or have a drink there and pull the same stunt. Just be careful and don't let one of them entice you more than you can withstand. Not anything like I expected. Least I found I can leave there with a smile on my face, whereas the casinos have the opposite effect. Met the madame Susan Austin who also likes bikes. Very nice lady (Okay. Very rich too as you can see by her extensive artwork collection from around the world in her rooms).
A bit south is Virginia City, NV which is sort of a cool stop for historical sake. Ramada Inn is their newest crash place. Others are allegedly haunted, although I think it more often the owner with some prostate late-night issues.
Mammoth Lakes, CA is a nice place to stop-over as well. No lake there, but nice area and a cool pastry/sandwich place to eat at. Bunch of shops, too, if you like sporting goods stuff.
More remote is the road to the hiking area of Mt. Whitney west out of Lone Pine, CA. Nice picnic and fishing lakes there in the pines along with a souvenir and eating place near the trail to the top of Mt. Whitney.
There is also a road north of Oroville that goes to Buck's Lake that Sunset magazine called "A hidden wonder." Nice restaurant and good food, plus a really nice B&B is located there. In winter, the main road is only opened to snowmobiles. You can catch a ride on the snowcat out of Quincy, CA if the road is snowed in.
Fwiw, I know Hwy. 36 from the coast inland to Redding, CA is one of the highly touted motorcyclists roads in CA sort of like The Dragon, but it just didn't do it for me. It can get blistering hot and down to 1 to 1-1/2 lanes at times. The Redwoods Park area outside Fortuna is sort of nice, but it doesn't last that long. I thought Hwy. 96 a bit north was a better engineered road and followed a nice river with rafters, dredgers, and gold miners in it. Bunch of Bigfoot stuff around that area too.
You already know about Hwy. 120 through Yosemite. Only one scarcely visited is the road to Glacier Point just a bit south of the area. We camped at Bridalveil Campground one summer night and it was nice. We didn't even have a reservation as it is more remote and first-come, first-served.
Another road is the road from Hwy. 395 to Markleeville. It's one of the fav's in "Destination Highways."
That's all I can think of offhand.