As far as places that I have ridden, my favorites would be Bend, Oregon and Moab, Utah. I have yet to go to Idaho and Colorado for riding, then I'll bet these might change.
I love 31 Flavors, but it's usually only available during the spring and summer.
I think the last place I would go would be Johannesburg, California off the 395. It totally creeps me out. What do people do out there? Why are they there? Why haven't they left?
That's not totally true though, because I am willing to try anything at least once.