re: Banff and Lake Louise in late May…what to do?

We are going in July. We plan to dive to the Columbia Icefield Discovery Center one day; it's about a 2 1/2 hour drive, I think, from Lake Louise. It's about halfway to the town of Jasper. You can also book a tour that takes 11 hours, they may go all the way to Jasper.

We'll also do a lot of the activities in the links that HGG posted; wasn't sure there was anything, or much, about the CIDC in there.