We keep coming back to the Icefields Parkway year after year, it is the most spectacular road in the Canadian Rockies with lots to stop and see. At the center is the Icefields Center, where you can see the Columbia Icefield/Athabasca Glacier and actually go out on it. You can walk to it or you can take a Snow Coach out on it. There is also the Icefield center which is a hotel, restaurant and tourist stop. Downstairs there are displays with information on the icefields and the rockies.
We usually stay at the Wilcox Creek Campground, which is also the trail head for Wilcox Pass, a 7KM (one way) hike that the first people who came through the valley used. The ice has since receded where the highway runs and the Wilcox pass was abandoned, but it is a great hike.
I cannot say enough about the Icefields Parkway, if there is one highway to drive, this is it!