We used to go down a hill right onto a frozen lake.
Good times.
Our ponds in Texas would occasionally freeze before the advent of globull warming. We used to ride our bikes on them. We would always make our big dogs go out on it first to make sure it would hold us. The only hills that were steep enough were the embankments along the interstate overpasses. Good times. One kid that was in my 4-H group fell through the ice a couple miles down the road and drowned.
My most favorite sled run was starting at the top of the hill by my house. Asphalt road. Sled down it, pick up speed, jump the curb (We built a ramp) then sledding down this trail through the woods ending at the frozen creek which 30 feet later turned into the big creek. Made it all the way maybe twice. Better then a roller coaster. Flexable flyer. Long trek back.