This is quite a challenging hike: you’ll climb 700 meters on a hike of 4km, but the view is so worth it! Gorgeous. The path is very well indicated and there are benches were you can take a rest. The last part of the hike I found the most difficult, because there were lots of small stones on the steep path.

Sulphur Skyline Trail, Jasper National Park, Alberta, Canada
http://www.hikejasper.com/Hike-Jasper-Sulpher-Skyline.html

Visited July 2015. You can find my review about Sulphur Skyline Trail also on TripAdvisor.