you need to drive away from Innsbruck and go to St. Anton (a town near the border of Switzerland). Two mountains there I HIGHLY recommend are Lech and Zurs. TONS OF POW!! And STEEP!
http://www.ski-europe.com/resorts/zurs.html
Also close to Innsbruck is Stubai Glacier-pretty cool mountain! I would say stay far away from Kitzbuhl...what a tourist trap and the skiing was so so.
Have a killer time! And drink Red Bull out there...way more potent than the American version.