There are yurts. You can book as far as 11 months out. You can also book the same day (as long as there are openings). There is a 2 night minimum for weekends. If you have any questions about the yurts, I can answer them-I work at the park.
You should call the office because I think there are some large round tent like cabins or something on top of the hill behind the park. You can see them in satellite view.
There were no cabins unless they've added them in the last year or so.
Thanks! Your answer is awaiting moderation.