Before our trip to Montreal, we learned about the Chinese Lantern exhibit in the botanical garden and listed it as a "Must See". Gorgeous handmade lanterns travel from China to Montreal for display in their "Garden of Lights". Admission was $15/person but worth every dime and the Metro will dump you within walking distance.
We had a difficult time finding the "Garden of Lights" within the Botanical Garden because of the French language barrier and probably because some of the Canadians behave like rude French folks. (Yes I said, "French" and "folks" in the same phrase). But once we got our bearings (and Hubby peed behind a tree--it was THAT dark) we were off on an amazing path to loveliness.
At one point, we were all lost from each other due to the crowd of people and children in strollers (they should really have an adult only night.) My one criticism is to have lights along the path so you don't trip or step in Hubby's pee.