Enter the Katy Trail. The Katy Trail State Park (in red) is a recreation trail that runs 225 miles across the middle of the state, at times following parts of the Lewis and Clark historic trail.
It's pretty accessible from almost anywhere I usually am, so I've started using the trail for my workouts - including one 2-hour bike ride a couple days ago.
The trail is used by thousands of people each year, and communities along the trail are very welcoming of trail users.
It's also neat because you go through all kinds of Missouri country-side, riding along rivers, cutting through farmlands, passing by farmers on tractors, grain silos, rockwall formations, pastureland, you name it.
I like going past old farm-town churches like this one, which I have a soft spot for.
A few other pics from the trail:
Crossing back over the Missouri River into Hermann...