Children do well here, and the reason is not the history. It is that a national park has been laid over a town small enough to walk across in fifteen minutes, with a bus, a working railroad, two rivers and a blacksmith in it. Everything is close together, most of it is outdoors, and almost none of it requires standing quietly in a queue.
The first thing in your favour is the price. Under-16s enter free, and the adult fee is $20 for a car or $10 a head on foot, valid three consecutive days. That covers the exhibit buildings, the shuttle bus, the trails and whatever ranger programming is running. There is no per-attraction ticketing to negotiate, which removes the usual family-holiday arithmetic entirely.
The second is the shuttle. Most eight-year-olds regard a bus that arrives every ten to fifteen minutes as an attraction in its own right, and it solves the parking problem for you. Two rules catch parents out: pushchairs have to be folded before boarding, and coolers and open food and drink are not allowed aboard.
The third is that the good stuff needs no interpretation. A freight train crossing the river bridge. A blacksmith working in an open doorway. Two rivers meeting at a point you can stand on. Stone steps cut in 1810 that go up and up. A canal towpath flat enough for a five-year-old on a bike, when the footbridge that reaches it is open.
What you plan around is gradient and heat. The town sits in a bowl at about 509 feet with ridges on three sides, and on a July afternoon it holds warmth and humidity that the road above it does not. The lower town is flat; everything above it is not, and the surfaces are worn stone and cobble. Carriers beat pushchairs above Shenandoah Street. Water matters more than snacks. And Maryland Heights — three to four hours, up to 1,788 feet of climbing, no water and no restroom on the trail — is not a young child's hike, whatever the photograph at the top has made you think.
The last consideration is the subject itself. This is a town whose fame rests on a raid, a hanging and a war, and it is also the town where a college for freed people stood on the hill. Both of those can be told to a child honestly. There is a section below on how.