Picture a group of people clustered on a ski slope. From a distance, it looks like it might be a ski lesson. Clusters of ski patrollers have also swooped past on the same run, so maybe this is more of them. Except, no, most of these skiers are (look again) on their bellies, legs splayed behind, knees bent, skis crisscrossed above their backs a little like a bizarre scorpion stinger. They're sledding, and their bodies are the sleds.
I continue my methodical uphill pace until I'm even with these adventurers: giggling kids and one instructor. "Look at us," I comment, "having alternative fun." The grown-up nods, says "Last day of the season, and they get to do whatever they want." Turns out what they want is to body surf slush.