Calgary has some specatacular opportunities but Edmonton is not worth a trip if you only have four days. Kananaskis is neaby and there are some great hikes and scenery. Lake Louise and the Icefields Parkway are great in nice weather. The best hike: Go yo Yoho (Lake Louise to Rogers Pass) and go on the Iceline Trail - closeup view of the high mountains. If you want to see the Columbia Icefields you can get good views from trails off the road avoid the bus ride.