I'm an ex-Minnesotan and I just thought I'd throw out a quick post about my beloved former home and the awesome snowboarding that can be enjoyed there. Afton Alps, just east of St. Paul, is a great place to ride. It's small relative to the mountains of course, but with 17 lifts and runs for all levels plus a few terrain parks... AND being no more than 45 minutes away from anyone in the Twin Cities... well it's hard to beat! You can also check out Spirit Mountain up in Duluth for a quick day trip.
After I went to Big Sky, everything in MN seemed boring. I haven't hit the slopes for some time because of it. I'm more of a free rider per say. Spirit Mountain is pretty decent. I'm not sure about Lutsen but would be interested to find out. When Lutsen was open for mountain biking in the summer (is no longer), I did that. Seems to me that resort is more of a leisure slope riders haven from what I gathered but I'm not sure. Buck Hill in Burnsville is ok....kind of crowded, short runs, but decent park. Same with Powder Ridge in St. Cloud. I think Powder Ridge actually got worse over the years. Short runs. Afton, I was only there on the first day it open for the season on year. Long time ago. Only one run was open so I can't say much for that. Being I'm more into 4 feet of powder and long steep grades, I don't ride so much around here.
Afton probably has the longest runs, but they aren't too steep so get ready for a slow ride (which isn't a bad thing after a few beers in the Chalet). I'm from Colorado so I never bothered much with snowboarding in MN. In the winter, Frontier Airlines and Southwest have some smokin' ski deals to Colorado and Utah so keep your eyes open.