There is so much to see and do in those areas. What are your interests? Are you traveling with kids?
These places are basically my backyard so if you give us a few more details I will happily provide some recommendations. I live in Calgary but spend a lot of the summer in Montana, right outside of Glacier National Park.
A general comment though, making a base in the US and traveling to Lake Louise is not very practical unless you are going to overnight in a hotel. It is a 6 hour trip one-way from the east side of Glacier to Lake Louise and that doesn't account for any time at the border crossing.