Replying to Solo Trip to Austria Dec/ Jan

Hi guys,

27 year old planning my first trip to Austria from Dec 23 - 13th Jan!
While I realise this isn't the best time to go, my office is closed during this time so it's my only window. I want to make sure I am going to get the most out of my trip, I am travelling solo and I want to stay in hostels, meet people, party a bit and of course, rip the Austrian Alps from first to last lift!

the plan so far:

-Fly into Innsbruck

Week 1: -Innsbruck Olympia Ski World ( 9 resorts from what I read - any suggestions/ advice -xmas markets good apparently)
Week 2: St Anton/ Ischgl - (want to party over new years - again - suggestions/ advice)
Week 3: Solden or Mayrehofen - Can't decide?

Fly out from Innsbruck

-Can anyone spot any major flaws in this plan? will there be enough snow? I've read solden has lots of snowmaking facilities and a pretty good nightlife and terrain parks, but Mayrehofen is also getting good ratings too!

-I'm into freeskiing and Park skiing, can anyone suggest a mountain that I have missed that is a must for someone like me?

-Is there a ski pass that covers all of the resorts?

Any advise would be greatly appreciated!

Thanks!