Question about buying tickets at the park...

I've been leaning towards getting a platinum pass for next season, and after I saw the offer for the free one day pass, I couldn't resist. So now I'm heading out at around midnight on Saturday night and will be getting to the point at around 8 or 9am on Sunday (I'm in southern Illinois, so it's quite a drive!)

So anyways, do the ticket windows open earlier than the park, or do they open up at 10am? I'd like to be able to get everything sorted out before the gates open if possible. I searched the official website and these forums, but I couldn't find the hours anywhere.

When I went a couple weeks ago I arrived at 9:00am and got my family's tickets then went in at 9:05 to use my platium pass and caught up with them at 10:00am.