On second thought, I think I'm on the wrong end of the park. This seems too tundra-y. not brushy enough for the Palliser area. Gotta be futher north, around Pinto or Pipestone / Siffleur. Let me think about this a bit; so, no guesses [officially] made by me here.
This Is Redoubt Mountain, in between Lake Louise and the Skoki Valley Lodge. @Langdon Greene, you're up, on account of the proximity of your Pipestone guess.
hints: elevation close to sea level
accessible only by ferry or air (or kayak)
rains a lot
sister town has same first name, but isn't on map
pretty pretty (= biggest hint here)