The Sulphur Skyline Trail near Miette Hot Springs is a rewarding uphill trail. There are lots of switchbacks but the views start appearing quickly. The summit panoramas are even more incredible!
The return distance is 8.8km return with 700m elevation gain. Allow 4 hours, longer if you're not used to prolonged ascents.
A Parks Canada parks pass is required to explore Jasper National Park ($22/day for a vehicle of up to 7 people).