J.
Mt. Hoy in Blackwell Forest Preserve has a tubing hill. You have to rent a tube (I think they are about $5 for the day). They have staff at the top of the hill and the bottom of the hill to make sure everyone is being safe. The only thing is that it gets tiring walking up the hill - but's it's good exercise. Also most of the park districts in the area have sled hills. You should be able to find out more information online. I know Naperville has information about their sled hills online.