This is the best indoor attraction in Miami for children between about four and twelve, and it is worth being clear about why and where it stops.
Four to twelve: excellent. The wind simulator, the touch tanks, the flight gallery and the aquarium descent are all pitched right, and the building is designed so children can move at speed without breaking anything.
Under four: it works, but they will get the aquarium and very little else, and the planetarium is dark and loud enough to be a mistake for some toddlers. Half a day maximum.
Teenagers: depends entirely on the temporary exhibition and the planetarium programme. The permanent science-centre galleries skew younger.
Practicalities. Strollers are fine throughout, lifts serve every level, the roof deck has shade but not much of it, and the café is the only food inside — you cannot leave and return on the same ticket without checking the policy first.
On a rainy summer afternoon, this is where everyone goes. Book ahead, arrive at opening, and treat the 1pm to 3pm window as the busiest of the day.