Art and design museum in the Parco Sempione. Some permanent and some rotating exhibitions. Definitely visit the Casa Lana installation and the Italian Design permanent exhibit.
Rotating modern art exhibitions in a complex of. beautifully design/renovated buildings, designed by Rem Koolhaas. Also has a great cafe and restaurant.
Cozy ambient inside, but also with tables on the street, Champagne Socialist is a good place to try natural wines from Europe. You can also go there just to buy a bootle (or more, of course) and drink it at home.