It would be a shame to go to Kentucky and not visit Mammoth Caves. Just amazing.
If you are going in the summer, you can avoid the hottest times of the day by doing a cave tour at that time. It's always a steady 60 degrees in the caves.
We stayed at the Yogi Bear just down the road and had a really good time; they have a pool and water slide that our kids took advantage of every day. Mammoth Cave has a campground right next to it that is probably very convenient, but we wanted the full hook ups and pool.
