You can either hike to the top or take the gondola. We were lazy, so we took the gondola. The gondola is quite expensive, but will get you on the top in no time.
The views on Banff from Sulphur Mountain really are incredible, extra bonus points for the reconstructed weather station and the interesting information about the Cosmic Ray Staion.
Sulphur Mountain, Banff National Park, Alberta, Canada
Visited July 2015. You can find my review about Sulphur Mountain also on TripAdvisor.