Florence, a CIty of Elegance
Florence is so beautiful and elegant. Ponte vecchio looks like a fairy tale, and Santa Maria Fiore (Duomo) will leave you breathless. There are good food and gelatos if you find the right places. If you are really into arts and architecture, you will fall in love with this city. Every attraction is within 30 minute walk. Also very close to Pisa, Lucca, and Siena, it is a very convenient location. If you want to go to Cinque Terre, however, I would make a day trip from Pisa.
Insider Tip:If you want to go out, Sant Croce is it. Good restaurant and Panini is in a little Piazza Cimatori. Go to Piazza Michaelangelo at sunset or at night, and have a drink and chillout there. There is also a little beach near the bridge where Piazza Michaelangelo is. Firenze card is worth purchasing if you want to see everything as you can skip lines and attractions are pricey. Knowing a bit of history here can make sightseeing more fun. Do free walking tours!