With kids, give Museo di San Marco (Fra Angelico) a miss.
Walking the silent dormitory corridor and finding a luminous Fra Angelico fresco in cell after cell — crowned by the Annunciation at the top of the stairs — is one of the most quietly moving experiences in Florence. The catch: it's a contemplative single-artist museum that the rushed overlook, and it sits just past the Accademia where most people stop. A serene, uncrowded reward for those who slow down.