Having ridden just about everywhere in the lower 48, I can tell you the PAC-12, Mountain West, and the SEC all have superb riding. They're all equally challenging but offer several differences. The Southeast roads are short, but there are tens of thousands of them and it's easy to just get lost for hours at a time. The Mountain West's are smooth and wide but full of cyclists and, occasionally, road salt. Commiefornia & Whoregan have by far the most miles of insanely twisty stuff, but you're stuck riding it with millions of Californians
I remember I was there once with a guy and we had a blast riding all day, I guess it was about 3pm and we were heading back towards the store, and here comes an 18 wheeler you could see through the trees. he got stopped, mid corner and the a8 wheeler kept coming. He was pointed downhill so there was no backing up on a motorcycle, so he ditched his bike, and the 18 wheeler ran it over.
Dude was ALWAYS a clown, and decided to over play what had happened and almost as soon as his bike hit the ground, he ran over to the side of the road and jumped off the edge, not a big jump, but he landed just right and broke his legs