Obviously that would fit. There is a place to put Work and other experience, essentially a resume builder. But just skiing recreationally--even competing individually--doesn't really fit unless you were on a team.
Everyone's different, of course. But I prefer to put things like skiing in my essay. Your Common App essay is supposed to reveal your passions. Skiing fits perfectly there. Obviously you don't want to be cliché, so there's some pressure to work it in nonchalantly. But I'm of the opinion that that is where it belongs.