The park is easy to locate and there is a $5 day use fee for non Montana residents. The camping area is immediately to your left as you drive toward the caverns. There is a playground and the area is flat and open so it's good for the kids to ride their bikes. There are some electrical hook-ups and a dump station for campers. Plenty of parking but not too many camping spaces. They are a first come first serve set-up except for a few cabins and a teepee to rent, which needs reservations. The bathrooms are clean with flush toilets and showers are available (for a fee). There is a large sink at the rear of the restroom building which is great for washing dishes. There are trails from the campground to the caverns but they are fairly long so we decided to drive. The road to the caverns is uphill and switchbacks but is a good road. At the parking lot there is a information building next to where you purchase tickets for the cavern tour. There is also a gift shop/restaurant area where you can get sandwiches and ice cream. There are bathrooms located just outside the gift shop. For those bringing dogs, there are kennels available. They are located below the parking lot with a stairway leading to them. There is water avaiable from a spigot so don't forget the water dish. To use the kennel you leave your driver's license at the ticket booth and they will give you a lock and key. There is no charge for the kennel. I can't remember the exact cost for the tour of the caverns but I think it was about $10 or less per person. If you are planning on taking a tour you will need good walking shoes. It is a bit of a hike up to the entrance of the cavern that takes approximately 30 minutes. The entire tour lasts about 2 hours. It is cool inside so a light jacket is nice. A flashlight is handy but not necessary. Pictures are allowed but flashes aren't in certain areas. No food or drink, other than water bottles are allowed in the caverns. The paths are well-lighted inside and very safe for small children as long as they don't stray from the group. There are areas where it is wet and sometimes you may need to sit down and slide through a narrow opening. The view is fantastic! The caverns are full of stalactites, stalagmites and columns. The guides are knowledgeable and entertaining. It is well worth the time and effort to go through the caverns. It's an easy day trip and not far from Yellowstone National Park.
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