Fort Smith to Fayetteville real nice. Plenty of twisties there. Almost no cops, just have to watch for the trucks. Real good trout fishing up there too. Pac coast hi way is real nice too. San Fran to San Diego has a bunch of nice runs. I've heard north does too, all the way to Seattle, never been. Blue Ridge Parkway Ga to Maryland also real nice with lots of bends. gotta watch out for the deer there.
To keep from Crossing the Rockies at 9,880 ft elevation in a surprise blizzard, I backtracked out of Grand Junction, Colorado and found one of the most scenic roads in America.
1. Hwy 128 from Cisco Utah to Moab takes you thru the Arches Natl Monument alongside the Colorado river and has awesome sandstone sculptures at sunset. Stop in Moab at the Indian Cafe and get some frybread...Umm
2. Coming back from New Orleans Mardi Gras went through Ft. Smith and Branson, Missouri and cut over and too scenic Hwy 19 and followed it north for 2 days. Lovely rolling hills and streams. Follows the Lewis and Clark trail and has many Historical markers and Civil War Interest sites.
3. Hwy 1 up the coast of California from 3 Arch Bay to San Francisco.