Have you tried Blanchard Spring Caverns (northwest of Mountain View, Arkansas)? It's a world-class cavern that doesn't get much publicity because it's operated by National Forest Service, which doesn't advertise. There are two different tours. The town of Mountain View is known for its folk-music festival.
Do you know about Turpentine Creek Wildlife Refuge, south of Eureka Springs? It is a rescue operation that specializes in tigers and other large cats that are no longer wanted as "pets". They have daily tours and an rv park.