OK kiddies,
Here are a few routes to choose from. We have just about anything you want, long sweepers, tight technical twisties, goat trails for the stout at heart, often on the same road. Pick and choose, any and all, any of these roads are good roads.
BE AWARE! Forrest rat are everywhere! Many stretches are guard rail free and LEO's are few and far between. That can be a good thing till you need one. Also, there are lot's of Marijuana grows in the area, and they can be pretty fierce about defending them. For the most part, they are off the beaten path, so keep it in the back of your mind as you ride the remote areas.
Construction on 299 is a fact of life here. They are straightening Buck horn summit. it is pretty much a 24/7 deal at the moment. Last time I went through it was up to a 45 minute wait and there was no asphalt for quite a stretch, just hard pack that got squirrely in a few sections.
Construction area
https://goo.gl/maps/Pm493gjEH7v
Want to do the full Monty on CA 36? I made this one a loop so you get the best of both 36 and 299. This will be an all day ride.
https://goo.gl/maps/QSV7yqAJ3Yq
Don't want to do the full Monty? Go for the half Monty.
https://goo.gl/maps/g9ZBLW8QL2M2
Want a more backwoods half Monty? (Great route, but I think you miss some of the best of 36)
https://goo.gl/maps/sd6cKkbeaaL2
Don't want to ride I-5 to Red Bluff? Here is a short stint on I-5 ride that gives you most of Westbound 36. Bowman is not super twisty, but is prettier that I-5 to Red Bluff.
https://goo.gl/maps/peLL48WcRBu
Want the locals route to 36? Ditch Grade Road is a local favorite.
https://goo.gl/maps/CFztpXrrNJv
36-Been there, done that? Go North young (wo)man. To my knowledge, Hwy 3 should be back up and running by the then.
https://goo.gl/maps/LJvXk26kmSM2
Want to ride over a volcano? We got that too. Mt. Lassen is a NP, so there is a fee. Want to make a day of it? Hit Burney Falls,
https://www.burney-falls.com/, This is also a fee area, but if you go, I know a free parking area that a short hike in will get you to the same spot. Then down the road to Sub way caves (bring a flashlight, 20 minute stop and FREE!)
https://www.fs.usda.gov/wps/portal/fsinternet/!ut/p/c4/04_SB8K8xLLM9MSSzPy8xBz9CP0os3gDfxMDT8MwRydLA1cj72BTJw8jAwjQL8h2VAQAzHJMsQ!!/?ss=110506&navtype=BROWSEBYSUBJECT&navid=100000000000000&pnavid=null&recid=11435&ttype=recarea&pname=Lassen+National+Forest+-+SUBWAY+CAVE
and then head on up to Mt. Lassen
https://www.nps.gov/lavo/index.htm You can hike to sulfur pits at Bumpass Hell or climb to the peak. Lot's of places to get off the bike and explore. My personal favorite is Kings Creek Falls
https://www.nps.gov/lavo/planyourvisit/hiking_kings_creek_falls.htm. Lunch at the Mineral Lodge is an experience to say the least. If you want, there a few wineries in Manton that have some pretty tasty offerings.
https://goo.gl/maps/xxcknkR8Bs82
If you want to head East, there are a few tasty roads that are within striking distance. Dougie bear has more knowledge that I in this area. One of my favorite day loops in that direction is Bucks Lake Road. Or, you can just stay on 70. Side note, there is a Shakeys Pizza in Oroville
https://www.shakeys.com/locations/oroville
https://goo.gl/maps/Tf6ckNMMBGQ2
Enjoy!