Route 7. Both scenic and twisty. Low traffic density, excellent road quality. Many side roads east and west off of this absolutely beautiful and very lightly traveled road. Killer vistas and scenic turnouts. Pavement is absolutely pool table smooth. This is the place to take a big sport bike and let 'er eat! Don't go in the fall, too many motorhomes enjoying fall colors.
Arkansas/Missouri, Road K. Both twisty and scenic, low
traffic density, excellent road quality. There are a long line of highways
accessible from Highway 71 and 412 between NW Arkansas and SW Missouri.
One of the best is Highway K near Goodman, Missouri. It runs east, then
south into Arkansas to Pea Ridge. It's recently been resurfaced but there
are hardly any gas stations for an hour - hour 1/2 riding.