As my place of birth and home to all of my extended Family, Montreal is AN awesome town with unlimited tourist potential.
However, Tremblant is a couple of hours away and has plenty of it's own attractions to keep you satiated. I suspect you won't want to go anywhere
None-the-less, Montreal has attractions to suit any need. The best partying in North America, awesome restuarants, fantastic shopping, the best of it underground, beautiful historic architecture, inspiring museums, etc, etc, etc.
If it's open I would make sure you get to the Bio Dome, near the Big O, and do not miss the Musee McCord.
Back about five years ago, the Blue Dog on Saint Denis was an awesome spot for drinking and having a good time.
Tell them "Too Drunk and his brother" sent you ;-)
I'm the brother btw...
-bear