I am working as a ski instructor at my home mountain. its an awesome job; I work part time(3 days a week) and when i don't have a lesson I can just freeski untill they need me. It may be little pay but it gives me an excuse to ski more, help people get into the sport we love, and get a free pass :)
I suggest going to the mountains job fair if they have one.
Become friends with other people in the park crew and show them you would be a good asset
Fill out an app even if youre under 18 that way they will have you on record.