I have stayed there. The park is nice but nothing special. It was originally built as a KOA. Clarksville is home to Fort Campbell and the 101st Airborne Division. There is a museum on post that is worth seeing. To get on post go to Route 41A north of Clarksville and enter from the main gate (gate 4) and keep to the right. Follow sins to enter the parking lot of the building where you can get a pass to get on post. Ask for a post map and directions to the museum.
Bowling green, KY is not far and you can go to the Corvette plant there and see Corvettes made and visit the Corvette museum.