Brought some out of town guests to tour our city with the Toronto City Pass. Per my tip, entry is included with the Toronto City Pass. If you plan on going to CN tower too, you've already got your money's worth. The ROM, Casa Loma, Science center/Zoo are just a bonus! Buy City Pass at Costco.ca ($63) for further discount. Vouchers for city pass are emailed to you.
Definitely one of Toronto's best attractions. I was quite impressed with the design. The conveyor belt to see the ginormous shark tank is brilliant! And there were sooooooooo many big fat sharks. Thought ok...there's probably like only 1-2 sharks, nope, there's one passing over your head every few seconds! Amazing photo ops. Yes the aquarium is crowded but we still got to see everything and the conveyor belt really helps. Everyone gets to see and it's a long ride so you don't feel like you have to go again because you missed seeing the shark or ray, or whatever else floats your boat.
Proud to say this is in our city!