According to my two-year-old, the best exhibits at our city museum are, in order: the revolving door, the lift buttons, and a floor vent near the café that blows warm air.
Plan for their museum, not yours
One gallery, properly enjoyed, beats six galleries at a march. We pick two things to find — the biggest skeleton, the shiniest rock — and let everything else be a bonus.
And we always, always leave while it’s still going well. The gift shop exit route takes military planning.