Might as well ask what it's like to stay at a Day's Inn or Red Roof Inn on any given day. They are all different, and the human condition can vary depending on the time of year.

For example, I will be starting and ending a MT tour at the Missoula KOA for the third time. It will be moderately crowded on a weekday in mid-June and probably fill up when I end the tour two Saturdays later. It's pretty sedate, and most of the tent sites are away from the RV sites. I always get a special tent site that is fenced off and has a partial overhang to keep you dry. The grass at the site is thick and well cut. My biggest complaint is that they need to turn up the hot tub water temperature.

The KOA I stayed at in SD, on the other hand, was combat camping at its finest. None of the tent sites offered any shade. (I was quite lucky that the day was cool and breezy.) Lots of vehicular traffic. Loud kids riding bikes all over the place. Massively crowded pools. Loud drunks with their beers taking over the hot tubs. Bad service in the restaurant.

While I have never stayed there, I have ridden past the KOA in Butte, MT. The tent sites are visible from the road, and the entire place is right next to I-90. I read some less-than-flattering on-line reviews about the place and decided to book a room at a cool, old hotel/motel in the center of town. Will be staying there again this June.

BTW...Keystone is about as "tourist tacky" as you can get. Lots of tourists waddling around eating ice cream and French fries. Periodically they have fake gun fights in the street. When I did my loop ride from the SD KOA to Keystone and then around to Mt. Rushmore I took Old Hill City Rd., which runs behind the KOA. About 1.5 miles before Keystone I passed a nice, quiet campground. Had I known about it I would have stayed there instead.