Three CG's come to mind when I think of great places for kids:
Devils Garden in Arches NP. No waterslides, amusement parks, or organized activities. Simply a great place for kids to climb, explore, play on sand dunes and occasionally see deer in the CG. Even as an adult, I can stay at this CG for several days and never get in the vehicle. Over the top views for the adults too.
Zion NP has two CG's that kids love, South and Watchman. After sightseeing all day, the kids get to go down to the creek and play (actually the Virgin River, but it isn't much of the river most of the year). Generations of kids before have gone down there and built small dams to have some little pond to splash in. When it's nearing 100 degrees out, playing in the creek in the shade of the huge cottonwoods is what it's all about when being a kid. The setting beneath the cliffs of Zion Canyon isn't something one gets to experience very often in life.
Pinon Flats in Great Sand Dune NP of course has huge dunes right by the CG. Kids can run up and down until they are exhausted. But get there in the spring when Medano Creek is running and the fun is exponential. Like being at the beach with a creek that seems to have a mind of its own as it meanders over the sand. When we took the nieces there a couple of years ago, we couldn't hardly tear then away, even to eat. They're asking to go back again this summer.
Kids get enough manufactured entertainment. These types of outdoor experiences are something they will remember their whole lives. JMHO
