If you head East, then try
Piney CG in Land Between the Lakes.We stayed in the Dogwood Loop, it has full hookups and the bath houses are outstanding and they have laundry service at each house.
The hiking is good, there is plenty to see and do.
http://www.explorekentuckylake.com/lbl/I especially love "The Homeplace 1850". It is a working farm that takes you back to the 1800's. It is absolutely amazing to see these people work the farm like time stood still.
The Bison/Elk range is neat, but it is hit or miss on whether you see anything. Best to go in the evening they say. First time we were over run with Bison and Elk, the second time we saw one Bison.
The Nature Center is very nice, the staff is very knowledgeable and helpful.
My wife and her aunt like hiking, I stay back with the kids so they can enjoy a day by themselves. They said its great hiking too.
There really is a lot to do there.