Given that this Sunday did not have Haunt running; plus, with the State Fair occurring less than 2 miles away, I would not think there would be many folks at the park today.
Quick side note: KD is open from 10:30 am till midnight on Friday, Oct 10th (Haunt running). Also, they are open on Monday, Oct 13th from 10:30am - 6:00pm (No Haunt).
I think this is Columbus Day weekend. Many Virginia state workers have a holiday that weekend).