...Its not like there is one lift ticket that allows you to choose any resort...
Sure there is. Ski Big 3 has been doing this for many years. (Sunshine-Louise-Norquay).
If you are there to "party" make sure you wear protection. Banff is locally known as the STD capital of North America. Wouldn't want you to have a bad experience.
Sure it is, but then again, so are 30 other "resort towns"
To the Original Poster...
Choose between Lake Louise or Sunshine. I would recommend Louise. Sunshine is spread out with flat areas, and you need to know your way to the short-steep stashes that exist there. Sunshine does get much more snow though and it's 30 min closer.
Louise has overall steeper runs (ie: less flats) and much more vertical drop. Plus the views there are spectacular (still beautiful at the 'shine). Massive acreage with plenty of varied terrain.
Either way you're going to have a blast coming from Ontario. Just don't forget to pick up your jaw off the ground. Be a tourist and take pics, it's f'n beautiful there!
Avoid the weekend if possible. In Banff: eat lunch at Barpa Bills and pop into Rude Boys. 7+ years in Banff, that is what I recommend.