Last time I went to Ontario Place I wanted to shoot myself out of boredom. I don't understand why they don't just make access to the grounds free, and keep paid access to things like the rides, water park, etc.
I do remember one time I went there with my high school that was fun though. Some yacht owner was driving around the harbour blasting the Macarena while people danced on the bow. Even if they knew how embarrassing that dance was going to be years later, I think they still would have done it. That was priceless, but not an incident Ontario Place can claim responsibility for.