Food & Drink
At Yguana Cafe, about 15 minutes from the Duomo, you can buy a cocktail or drink for 13 euros and then eat unlimited from the buffet all night long. In Italy they call this concept aperitivo. While different cities have different versions, my best experience with it has definitely been at this place. We'd been there several times years ago, and on our most recent visit we went again, and the food quality hasn't dropped at all. Incredible value for money. If I'm not mistaken, the buffet opens after 7 PM.
What to See
The Duomo is one of the most impressive man-made structures in Europe. Along with La Sagrada Familia, I'm blown away all over again by both its sheer scale and its intricate details every time I visit. Worth making multiple trips to see it in both daylight and at night.