It was a drive in movie, may have been in Ottawa if not Montreal as I had relatives there as well, also relatives in St Bruno.
I remember we visited Cognawoga reservation, Frontier Town theme park (that may have been over the border in the US

), also in Montreal there was a big glass golfball with a mono-rail and a 360 degree cinema. Also saw the Alouettes playing in the old olympic stadium.
As a kid from a council estate, Montreal was awesome, air-conditioned stores and motors with car-phones, my relatives neighbours had a swimming pool in their back garden, boy I'm starting to wish I'd immigrated too.