We spotted in this place amid the trees as we were checking out the Wasaga Roller Rink. It was difficult to determine what it was, exactly, but clearly it was a tourist attraction of some kind.
We did find a sign that appeared to belong to the Wasaga Beach Paint-ball group, which does border on the far side of this property.
On May 2, we had an opportunity to speak with some people who live in Wasaga Beach, and are familiar with its history.
As it turns out, this location was once Dinosaur Valley. Tourists were able to walk the paths, examine the statues, and hear about each species from speakers at each site. In later years, it also apparently featured some amazing sand sculptures.
UPDATE May 14, 2013: During a drive-by today I noticed that this structure has been demolished.