@mrmarv: What kind of distance do you want?
For a simple in-town loop, you could go down the Ohio River Trail to the end, then up McClure->Woods Run->right into Riverview Park. Climb to the top (or do the loop all the way around the park a few times), then exit right and out to a right on Perrysville Ave to eventually hit Federal St and come back into town. That'd be roughly 10 miles out and back from downtown.