The TIFF has a number of interesting attractions, including for kids! Their kids exhibit has amazing technological interactive and creative activities that are an absolute riot for adults too. There is a wonderful library upstairs at which you can request to watch any film in their catalogue at a personal station. There is a local archaeological history section from when they excavated the site and discovered all kinds of interesting artifacts (also located by the library). I got a tour of some of the items they have in the back, too, including amazing props and over 10,000 posters. This must be a great resource for researchers.
All of the staff were very helpful, kind and interesting people.
I was there for a special event, so I don't know what their regular programming is like, but the theatre itself was very comfortable. The kids festival was going on at the same time and that looked excellent.