107 is a nice little road. But, the best is "get on 28, ride to Walhalla, turn around, ride on 28 to 129, keep going. When you get to Maryville, turn around and ride back to Highlands. Repeat, repeat, repeat, etc.
It's like watching a fire dance or the ocean roll. The movement is never the same twice. Take any of the side roads. There is an adventure on each one, even the dead ends.