I've been thinking a lot about Fleming Road (runs from Route 120 to Country Club, about 2 miles). If you haven't driven it, it is worth the drive. Truly one of the most scenic roads in the county. Hilly, wooded, gentle curves, the whole bit.
A friend calls it "tummy tickle" road because of the hills - a name that started when his kids were little and they liked the roller-coaster effect of driving along Fleming!
BUT, it is technically a county highway that is considered by them to be the route from Route 120 to Route 14 by way of Country Club Road and Ridgefield Road.
It may be safe to say that "scenic" is in the eye of the beholder. One person's scenic drive may be tedious to another who just wants to get from point A to point B as quickly as possible, and is annoyed by the hills, slower speed limits, curves and trees close to the road.
I love driving through the county's gently rolling farm fields, but know people who think this area is too flat and the farm fields are b o r i n g.
Whether one likes scenic vistas of farmfields, or curvy, hilly routes that cross through examples of the county's glacial remants (moraines, kettles, kames and outwash plains), there are many scenic driving experiences to be had in McHenry County.
For example, I think most any road through Bull Valley is scenic, with their windey turns and hills, plus the trees overhanging the road and the farm fields stretching across the rolling hills.