At one time I would have included Ontario Place in my must-see section however no more. Ontario Place used to be a great attraction that all ages could enjoy but sadly this is no more the case. It still has a decent but not exceptional waterpark on other rides so the kids might find the place amusing. However there is nothing that is even remotely interesting for adults here.
Why this is so is very controversial? When it was initially opened back in the 1970's, Ontario Place was full of restaurants, bars, and nightclubs. Things that adults might want to visit after dark. For the most part these have closed down. There were also a couple of venues where you could see entertainment including free concerts by up and coming entertainers, other bands in the twilight of their careers or even the Toronto Symphony. This usually went on every night during the summer. The venue that this all took place in was torn down to be replaced by a huge megaconcert outdoor venue. Oh sure high price top dollar bands like R.E.M. or David Bowie might play there but they are not on concert every night. Hence there is nothing to draw people to the park after dark on many evenings. While you used to go an visit Ontario Place a couple times a year for a decent show and then it one of the nearby bars, now you are hardly ever inspired to visit for any reason. Furthermore, the albeit temporary, home of the Canadian Baseball Hall of Fame used to be there. It has since moved on but nothing has replaced it as an interesting showcase for adults. Even the HMCS Haida has pulled up anchor.
The place now looks rather sad. The Cinesphere, where IMAX movies are shown, might be an architectural jem but it needs to be cleaned. It is as yellow as an old sailor's tooth.
If you have kids, Ontario Place might be good. There is an IMAX theatre there too, the original one in Canada, the Cinesphere. Otherwise Ontario Place is a bloated waste of space, it had a lot going for it in the 1970's and the 80's but it's been so neglected. It's also overpriced.
Unique Suggestions: If you have kids you can have fun. The pedal boats are great to take, under all the pods. Sit back and enjoy the water and the skyline.