We were just there last Friday. We were on holidays in Kitchener, so it was close. It is just a small park, but our girls, 9 & 14 (and Dad too) had fun. The water park was decent and clean. We liked the tube ride. The go cart track was long, but somewhat rutty in spots. We only played one of the two mini-golf courses and was fairly impressed with the condition of the "grass" and the challenging holes. The amusement park was just a few older rides, but if you like bumper cars, you should have fun there. We did the rock climbing (first time for all of us). It was really cool to do, but because this was our only time climbing, I can't really rate it.
All in all, we had a good time. I think it depends on the age of your children. If you have younger kids,(under 12-13), this park will give you good bang for your buck (especially with the exchange on U.S. $). We paid $90 Canadian for the 4 of us. But if you want more of an amusement park and water park, Canada's Wonderland is the place to go...Great coasters, big water park and a good kiddie land. It will cost more, but you get a LOT more.
Canadave