I'm off to the Rockies at the end of the month, although we are going for longer. As I understand it, the Icefields Parkway (Banff to Jasper) is one of the 'must drive' roads for views etc. Given your timing, I would drive up to Jasper on the Sunday, stopping to see things en route (lakes, waterfalls, nature, glacier etc.) and stay in Jasper Sunday night, then drive back down on the Monday, doing some other of the attractions on the way.