Upcoming Trip to Montreal

[Parkway]

I tried this in the Sky Bar but it was suggested I would have more luck here.

I will be visiting Montreal with my girlfriend at the end of May. I'm hoping to enlist some of you fine people in figuring out what we should do for the 5 days we will be there. Here are the categories I'm looking for help with:

1. Things we should definitely do, can't miss attractions. Things that are in a guidebook but still live up to the hype.

2. Things to skip, they might be in the guidebook and all over the internet but its really just not worth it. (Philadelphia example: the Liberty Bell)

3. Underrated attractions and things locals like to do or places they like to hang out, things that won't appear on Trip Advisor.

Lets hear it!