The Icefields Parkway approaching the Columbia Icefields. Looking towards Mts Athabasca and Andromeda from the route
 

The trail up to Wilcox Pass is one of the prettiest in Jasper, and the view from the top is astounding.  If you are looking for a nice half-day adventure, this has a lot of bang for your buck.  Starting at the trailhead at the entrance of the Wilcox Pass Campground, the path steadily climbs up through the forest for a kilometer before it breaks out into the alpine.  Another 600m or so brings you to a pair of red chairs overlooking the impressive Columbia Icefields area.  The winter trail is usually pretty packed down, but if there has been recent snowfall, snowshoes would be a good idea.  Otherwise, crampons do the trick. 

If you're wanting to go further to thepass (4km from the TH), be warned you will pass through avalanche terrain.

Snowdome and Mt Kitchener from the route up to Wilcox Pass Viewpoint Pausing to take in the winter scene. Red Chairs just over the hill at center. Wilcox Peak Looking behind the chairs. Mountain sheep feeding on the cold slopes. The view from the red chairs at Wilcox Viewpoint Almost to the red chairs