At night the streets are much quieter. No hordes of tourists.
It’s easier to get in and out of the gelato shops with THE BEST CHOCOLATE GELATO IN THE WORLD.
Or you could stop at Rivoire for a nightcap (or super thick hot chocolate, tiramisu, and panna cotta).
You could have a martini at Slowly, where they make interesting art out of your olives.
The bride-to-be might drink all the drinks.
Even this guy looks great at night.