It was ok. My family enjoyed it. I get a little bored in caves. Very cool cave. The kids loved the national park book we bought there and then they get stamps at every national park or monument you stop at. That was worth it.
Thank you for the review and especially for sharing the park store purchase ... many visitors LOVE the NPS passport program. We are confident that your kids will want to visit every national park to collect the stamps. So, get prepared for some incredible adventures.
Best wishes for the remainder of the summer season. Keep exploring America's treasured resources.