are there any buildings you can rent

There are also cabins for rent.

There is an undercover area at the top that you can rent. I'm not sure how much it costs though.

I just watched a Grants Getaway show featuring this park. There are cabins for rent. They are heated and sleep up to 5 persons for only $43 a night!!!

There are two halls to rent. One in West loop has a sink, counters, tables, chairs, wood stove, electric, and wall heaters. The other hall is up in cabins and has a full kitchen, indoor plumbing, tables, chairs, wood stove, and electric heat. There is an undercover area that can also be rented with a beautiful view. At this time, I believe the cabin hall is 200, west is 75, and the undercover area is 50 for the day.

Yes, near the group tent camping area there is a meeting hall. It has a wood stove, heaters, sink, tables and chairs. There is a bbq just outside the South doors.