My daughter(5) and I are tenters. We love the KOA campsites for their amenities and generally above primitive camping features. This KOA at Mountainside does not have a lot of Kids stuff to do like a lot of other places. Of course all my reviews will hold the buildings KOA as the standard bear for camping with kids. But getting back to Mountainside, it only has a playground, but the staff is really really good. We were in tent site number one which they said was unlevel, but it was fine. It backed right up to the stream that gave an incredible calming sound all night long. There were two fire pits and electrical. It is spread out, lots of tent spaces, the bathroom facilities were excellent. 

 The store was well stocked, and not overly priced. They have a pizza place that I have heard was excellent, but we did not try it.

I continue to be impressed with the KOA experience (with the exception of the West Yellowstone KOA).