This is how the Denhams roll...
Is your tubing hill not fast enough? This problem is easily solved. Just rally a large group of people willing to trek up the hill, in the middle of the night, in sub-Arctic temperatures, with 2 large coolers filled with boiling hot water, and a big wok, so you can dispense and spread the hot water, creating a thin layer of ice over the entire sledding track.
Yes, they are hard core. It made for one sweet ride.