Sandusky Bay is well frozen. Off the city, its not great, but there are two areas that are good and safe. The area between Dempsey and Johnson's Island is solid, as is the area between the city and Cedar Point. Ice access is from the Sandusky Boat Club by Battery Park Marina.
For a HUGE expanse of good ice, try West of the Edison bridge. Ice access is from near Bay Harbor Marina. You need to pay $5 for parking, and there are a lot of ice fishermen, but I can't seem to find anyplace else to park near there. But this is a HUGE area of very safe ice. The water is mostly around 4 feet deep, and some places the ice is resting on the bottom.
I'm hoping this snow system coming through isn't going to drop too much snow on the ice because I want to go for speed, but it might do some good for you snowboarders.