The area is quiet and beautiful, and the campsites are huge because they are for multiple groups. We went in November, knowing it would be cold, but we were still surprised there was no heat in the vault toilet spaces. There is also no sink of any kind so bring a portable one if you are tent camping, like we did. There was water and electricity at each site. The sites aren't marked very well, so it's tricky figuring out which is which.
And if you are tent camping, and want to shower, you have to go to the service building near the hotel which is for campers. It's about 10 minutes away, taking the ferry bridge, which is fun.
The showers are coin operated, and at the time, the women's only had one out of three working. The men's showers seemed to be in better shape, and you'll need at least $3 in quarters to have a decent shower. There are quarter-change machines, and there is a laundry room as well, all in that same spot. I was a little annoyed to have to pay for the shower, seeing as that we were paying $50/night to camp, but I can see how it conserves water.
It was a good experience overall, and we really enjoyed the cave tour we took.