Mon dieu, ou commencer?
Check out the Tourisme Montreal
website for tons of info.
All of the above suggestions, plus......
While you will miss the Jazz Festival or the Just for Laughs comedy festival, there is never a shortage of cultural activities. For example, if you like to see actors or dancers in action, there are public rehearsals at Place des Arts.
There are hundreds of gourmet restaurants in Montreal, many in the undiscovered banlieues (suburbs). Two examples I can vouch for are Restaurant YoYo
and Le Poisson Rouge
If you don't mind getting wet, try jetboating on the Lachine Rapids
If you like funky architecture, check out Habitat 67
and the bucky ball at the Expo 67
pavilion: this year is the 40th anniversary.
And don't forget to buy Montreal bagels
at St. Viateur Bagel
, and to have a Montreal smoked meat sandwich
before you go home.