Something that hasn't been mentioned, and I don't know if I remember correctly, but almost all of this is a National Park.

Someone else can correct me but there aren't many places between the main attractions (Jasper, Lake Louise, Banff) to stay at night.

So you need to plan your days so as to get from point A and have a time line to get to point B. It's dark around 5-530 if I remember correctly.