I agree with Catrina, unless the park is VERY empty, you'll be hard pressed to do the whole park in one day if you want to hit all, or most of the rides.
If you add in some time in Splashworks and a nice relaxed meal and/or snacks, it'll be virtually impossible to do it all in a day.
I enjoy Wonderland. It's not the "magical" experience of a Disney park to be sure, but it's relatively inexpensive (don't ever pay regular price for admission, there's always great discounts everywhere from Pizza Pizza to Pharmaplus drug stores), convenient and a fun way to pass a day or a few days over the spring/summer/fall. They always add at least one major new ride each season and overall, I think it's a very pleasant experience if you're into amusement parks.