Splash Down Dunes, a Forgotten Water Park

On the drive from Chicago to Detroit, we came across an apparently forgotten water park called Splash Down Dunes.  The only real evidence of a human presence was an abandoned wheelchair a third of the way down into a shallow swimming pool.  Perhaps the healing water of the pool caused the chair's occupant to rise to his feet, leaving the unneeded chair behind.  But probably not.

It could just be the off season... way, way off season.