Been there many times since it is in my home state. Cave tours are excellent, but also a good place for hiking, camping and fishing. Camp at Houchins Ferry area to isolate yourself from the crowded electric campsites. This area is tent only and you can fish in the river right off the cliffs.
"As an adolescent I aspired to lasting fame, I craved factual certainty, and I thirsted for a meaningful vision of human life - so I became a scientist. This is like becoming an archbishop so you can meet girls."