You can check out the websites of
Tourisme Montréal and
Tourisme Québec for ideas. Both also offer hotel reservations. Once you're in Montreal, the Centre Infotouriste (
Tourist Information Centre) on rue Peel can also assist you.
For kids, definitely things like the Science Centre, though you may want to check their website before going (for example, their current featured exhibit is
Sex: A Tell-All Exhibition, which may or may not be a little bit more than you were hoping to have to explain while on vacation, lol). Parc Jean-Drapeau has deteriorated a bit in the last few years, but is still a nice place to take a stroll in the daytime.
There's a great restaurant scene. Check out
The Gazette or the
Hour for suggestions on what to try (if your French is up to snuff, you can also check
La Presse or
Voir). Most menus are bilingual, especially downtown, but just remember that, in French, an
entrée refers to an appetizer, while a
Plat principal refers to what is called an entrée in English.