The rollover for the 11th lists that park as closed, but I would venture a guess of either 10-6 or 10-8, either way plenty of time to enjoy what should turn out to be a pretty empty park.
I just got a brochure from the park today about buying a season pass. There's a coupon in the brochure to bring a friend for $10 on Easter Sunday. So, it's apparently not just season pass holders. No matter what, it shouldn't even be close to years past with the other group there.
Sue