Riding near Klamath California

Hi folks, I'll be headed up to Klamath, California for a week , Its on the 101 , on the coast near all the redwoods. Any (off road , trail ) riding up there. Bikes are green stickers, late model yamaha wrs , not dual sports so no street legal.
Anything north toward Cresent City or South by Humboldt? "any " info greatly appreciated!
thanks

Dave