I think it would drive me nuts if my sims were sad the entire time I sent them on a vacation which should be a fun time for all. Yet again, the devs miss the mark on a snowy (what should be fun-filled) escape. But again, traits don''t matter. It's just one blanket mood for all that they code in to the game.
Hopefully they fix it so it's not just sad moodlets they get. Active, outgoing, loves the outdoors, sims should be invigorated/energized on the slopes regardless if they fall a few times.