Camp inside a cave !! The water cave is a truly unique camping experience. It even has a small waterfall at the back of the main chamber! The cave is set on the edge of a beautiful canyon, and has raised platforms to sleep on. Though it's not super tall, the cave is for group camping and has a place for tents/hammocks on the outside if anyone gets claustrophobic.
Call and reserve the water cave in advance. It is a group site and will cost around $40. Drive to Alabaster Caverns State Park in NW Oklahoma. Pick up your permits from the visitor center. Park in the NW corner of the main parking area. You will take a trail northwest for a few hundred yards before reaching the edge of a canyon and turning east to access the cave and campground. It's a short hike, so you will have to carry your gear. There are restrooms at the main campground back up the hill. The cave is covered and stays at a constant cool temperature. Bring a tarp to throw on the wood sleeping platforms in the cave. All you really need is a light-source, a sleeping bag, and a pad!