Are the Splash Pad, Mini Golf, and the cornhole still open for the season?

Yes

Yes. All 3 are currently still open. Get supplies for cornhole, giant checkers and mini golf in the snack shack at the splash pad entrance. Cash only. No credit cards

Yes the splash pad is still open.

It is on the West Side in the City of Oswego.

I don't know. I usually don't get to that side of town often