I don't know a thing about that resort, but as far as are most resorts open all week, it varies by ski area... I think if it's a "resort" it'll be open all week, as opposed to a smaller "ski area" that doesn't really have hotels, etc., which is more likely to just be open some days.
Bosses ALWAYS vary. Stress varies. I don't think you can make any blanket statements about that.
If you want to WORK, I'm sure they are always in need of people to shovel sidewalks and roofs. You have to narrow it down a bit. Do you want an IT job? Unless the labor market for the resort is really really lacking, I doubt if you can find part time IT work...can't tell if you still plan to attend classes and just work part time or what, but most RESORTS have their IT personnel for at least the full season and maybe year round. Once again, don't know a thing about that resort.
BUT presumably you want to SKI. That means you probably don't want to work day times, you want to ski during the day. So, IMO, best job is bartending. Good tips, and you ski before work. But....don't know about bartending jobs in UTAH!!!
You need to give us a ton more info about what you want to do and what you mean by "full of labor".