Ice fishing, ice boating, etc. does occur on the bay and lake. Walt is right though, the ice can be very dangerous, and unless you know what you are doing, I would stay off it. A few years ago, a well known ice fishing guide was killed at Put-In-Bay when he fell through the ice. So even the pros get into trouble. Even if you walk across the ice, it doesn't change the fact that CP is private property and construction areas are dangerous areas to outsiders. I'm sure the CP Police will be talking to you if you try it.