Hi, we are going to have two days in Milan with our 15-year daughter, very conventional American industrial tourists ;-p

Already booked a "special skip the line" two hour tour to see the Last Supper and Codex. I know we'd like to go onto the roof of the Duomo and probably ought to purchase another of the skip the line tours. Is there any particular tour company that is recommended?

Otherwise we'll walk around with thousands of other tourists, just like Disney World and Paris....

Any tips or advice, especially things that make wives and daughters happy but don't involve shopping? (That will happen regardless.)