Hiway 49 is a nice bike road,depending on the tourist numbers,it can be taken to it's upper end on hiway 70,could take a left at 70 and go through the Feather River canyon to hiway 89,turn onto 89 till you hit 36 and do a flyby of Lassen Nat Park,still too snowy to drive through it.
Find 36 west to the coast,best curvy tight road around these parts,1 or 101 will take you to Oregon along the coast.
Many other tight squirrel trail roads to be had but harder to describe.
My favorite out of Chico is taking 20 to Lower lake at Clear Lake,then 175 to Hopland,then down north 101 to 253 to Boonville,then Mountain View road to Manchester on the coast,all these roads are great on a bike,tons of corners big and small,great scenery,fun stuff.
Some bikes around at times