Paramount Canada's Wonderland is a great family Theme Park near Toronto Ontario. I have been there a few times now, including this past summer.
What should one expect at Canada's Wonderland? Rides, rides and more rides! From carosouls to roller-coasters, this park has it all. There is a kiddie section, a section of more family-oriented rides, extreme rides, and even water rides! There are also carnival-type games, and a go-carting track.
Wonderland is also a venue for special events. Almost daily, there is a children's show of some sort. (This year is featuring Dora the Explorer). There is a large, outdoor stage for concerts, which happen several times per season. And in the fall, they have their annual halloween events, featuring a haunted house, and a significantly spookier atmosphere.
There are plenty of meal options in the park: hot-dog stands, pizza places, ice cream, Chinese food, and a full sit-down medieval-themed restaurant. Prices are a little more expensive than they are outside the park (as is to be expected), but the range of options helps you find something within your price range.
The park does a good job of catering to families with children about 5 years old and up. There are no actual child-care facilities (ie. babysitting/daycare areas) for younger childre. But for the older kids, there is plenty to do to fill the entire day. There are plenty of children's rides, plus the general/family type rides, and the shows generally cater to this younger audience.
If you plan on attending the park with the entire family, including teens, I would recommend getting a weekend pass. There really is that much to do and see. One cannot ride all the family rides and the higher intensity rides all in one day. Also, if you intend to take in a concert or special event, you'll want to dedicate one day for rides and the other to general amusments and the event to get the most out of the experience.
Prices for the park are reasonable. Your admission covers most everything except for your food, gift shop purchases and the carnival games (paid ring-toss for prizes, and the like). Rides, and the children/family shows come with admission.
Wonderland spells fun for the entire family. It should definitely be on the agenda of any Ontario vacation.