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Canadian Wonderland
Niagara SkyWheel
La Ronde

I suggest checking the schedule for the parades and shows before you go. They packed a lot of fun into the day, but missing out on one of those really bummed us out.
I recommend bringing your own snacks and drinks; food prices are super high inside. Just be aware of the rules, though, as they have restrictions on outside food.
FlyOver Canada
Great Canadian Midway
Centreville Amusement Park
Playland Amusement Park

I suggest bringing your own snacks and drinks if possible. The food prices are a bit steep, and you might want to save some cash for souvenirs or more rides!

I recommend checking the weather before you go; it can really change your plans at Playland. A little rain can make it quieter, but be ready for some rides to be closed if it gets too wet.

I think arriving around 10:30 AM instead of the opening time helps avoid the long lines at the entrance and gives you a head start on popular rides before they get too busy.
EdgeWalk at the CN Tower

I recommend booking your EdgeWalk spot online in advance to snag a better time and save some cash, trust me. I missed out on a promotion because I procrastinated!
Galaxyland

If you're planning on eating there, consider packing some snacks. The food prices can be pretty steep. I spent way more on a lunch combo than I expected, so bring some chips or granola bars to save a few bucks!