Wizard Lake is located south of Calmar on Secondary Highway 795, west on Township Road 481 and then south on Range Road 271. The very long and narrow lake runs NE-SW and is a popular water-skiiing spot, particularly on the weekends.
Wizard Lake is also very canoe-able with good access and (the four times we've been there) very little wind. I'd guess the lake is over 10km long but only half a km wide.
There are several places to access Wizard lake but one of the nicest is on the east end (as per the directions above) at the Jubilee Campground. There is a very nice public beach (with concession and bathrooms) here and fairly nice swimming.
There is boat launch in the parking lot (below) here which makes for an easy entry.
There is also a boat launch (below) in the campground.
The lake is lovely, particularly in the autumn. It was known as Conjuring Lake when I was a kid and was the site of a famed nudist camp in the 1970s.
On future trips, we hope to explore it western end a bit more (perhaps by continuing down Township Road 481) which is reputed to be sandier and better for swimming. It is also subject to a speed limit which might make it friendlier to canoes.