Museums aren't all dust-covered shelves and drab displays. Head to Museo del Carnevale and be inspired and entertained. Every piece has a story waiting to be uncovered.
You're spoiled for sightseeing choice when staying in Viareggio. Museo del Carnevale is a good place to start here, but there are lots of other interesting places to appreciate. Forte dei Marmi Beach, Forte dei Marmi Fortress, and Massaciuccoli Lake are not far from the museum and will top off your day nicely.