The Dolomites are definitely where its at. I spent a semester abroad in Italy and made a trip up to Cortina d'Ampezzo. Such a huge variety of amazing terrain and so many resorts within a short drive of the town or several trams straight out of the town. such a sick place. good luck man.
I also made several day trips to a decent resort called Abetone about 2 hours outside of Florence, nowhere near as sick as the Dolomites though.