The most fabulous thing about Viareggio, aside from the stunning snow-capped mountains you see from the beach, is the two mile long promenade that follows their beach front clubs, shops and restaurants. On a chilly but sunny February morning, before the crowds and craziness of Carnevale, this promenade is full of folks meandering, while chatting with each other, while walking their dogs and while enjoying a sunny winter afternoon. The Carnevale season in Viareggio is the 2nd most popular in Italy, second only to Venice. The floats are impressive, the crowds are fun and engaging and the city is alive with festivities.
Viareggio is on the train line to the Cinque Terre, so if you are thinking about visiting there, I really recommend a stop here!