If I'm not mistaken, it has to be 5 years since your sentence was completed for the DUI/crime. Then you are eligable for "rehabilitation" that will make you "admissable".You're much more apt to be questioned if you're driving into Canada than if you fly. Also having a passport is HUGE. I've bowhunted in Alberta twice so far, and haven't even been asked about it. I have a passport that's been stamped twice.

Good luck.