I hope the city is at least providing the kids with a sledding app for their smartphones.
I get the impression you responded tongue-in-cheek but I regret to inform you that there are indeed "sledding" apps out there, so that our children can virtually enjoy - safe and snug in their onesie pajamas - something that us older folk actually got to do for real when we were kids.
With a strict Limitation of Liability clause in the Terms of Service in case you fall off the couch or strain a finger.