We were trying to drive through Skyline Drive, but didn't realize they close the whole thing for the winter. So, after we were turned away from there the only other thing that came to mind was to visit the similarly named caverns.
I am incredibly glad that I did it. I passed by them many times on the way from DC to WV. I have never had a guided cavern tour, although, I did some amateur speleo. One hour tour costs $18/adult and does a marvelous job hilighting all of the caverns details and history. Given that you have a desent guide, and we did, it's well worth that price.
The use of diferent colored lights from diferent positions would surely entertain kids and adults alike. Unique crystals that formed there in a vacuum are just astonishing. At the end I was surprised to find out that we've walked a mile and a half. Time flew by so fast and there was a lot of interesting stuff there.
I'll be sure to visit Luray caverns soon as others suggested here.
In short, go and visit these caverns, you won't be disappointed!