Sean from Columbia on 3/21/2010 2:30:20 PM:
I ride the katy a lot and have done everything between Clinton and Hartsburg. I'd agree that the stretch heading south out of Roacheport is the most scenic. For a one day ride, I'd suggest Roacheport to McBaine and back(~20mi total) or Roacheport to Columbia(turn off the Katy onto the MKT; one way ~20mi).