The Doumo is spectacular and well worth a visit and going a wander around the roof of it.
Beyond that, there's not much to see, unless you fancy spending a month's wages on designer gear. Fuck knows how you'll fill "a few days", even the pubs are pretty shite.
i was going to mention the Duomo rooftop too -- it's spectacular!
(there's tons of people at every tourist attraction trying to sell you bits of string and such.)
i liked Milan. it was less frenetic than Rome, though arguably not nearly as much to see and do.