Ghostly Manor in Sandusky, Ohio I know is open year round, but it is the only one I know is open that much in Ohio. They are very successful year round. http://www.ghostlymanor.com/
It seems that everything on I Drive is going more upscale and the area around the Convention Center seems to be doing extremely well.
We went to the Pirate Dinner Show one year and hated it! Skull Kingdom looked pretty intersting however.
I wouldn't mind seeing a couple of the cheesy tourist gift shops bite the dust as well.