I assume you are referring to the Little Miami Valley in Ohio.
I'm familiar with the area, but I haven't ridden a bike on the trails. It's a nice area and I doubt you'll go wrong wherever you choose to ride. There is a web site with lots of picture and information here.
The Interactive Trails Map has lots of pictures along the route. If it were me, I'd want to include Yellow Springs in my route planning (it's on the trail). That's the home of Antioch College, which is currently closed, but the town is a very neat artsy, old hippie hangout.