Replying to Stuff to do in Montreal.

I'm heading off to Montreal tomorrow with some buddys. The friend I am staying with said shes got some kick ass bars to hit up at night. The problem is I dont have anything to do for Saturday during the day. Skiing is not an option since i have a lack of car that day. Any ideas on places to go and things to see in Montreal during the day? I figure I'll wonder around for a bit taking pictures with my crappy little SLR, but I only have so much film... any other ideas?