I've been going to Canada's Wonderland since I was a kid and still continue to visit the park. The park is packed with rides of all kinds including 12 rollercoasters! It's home to Canada's biggest, tallest, fastest, rollercoaster, the Behemoth.
It's well kept and very clean. Going during the week makes the lines for the rides not overwhelming to hand. There's even a Kidzville and Nickeloden Central for the kids to enjoy. Plus, for those hot days, a water park that covers 20 acres! There are live shows all around the park as well, including the dive off the waterfall on the parks iconic mountian.
There are tons of shops and food options around the park too. Since prices can be a little high in the park for lunch or dinner you can always leave the park and return that day at no charge!
I always have a blast and I know you and your family would love it too. :)