I'm late to this posting.
If you're into hiking, and want some hiking suggestions, please let me know. Wife and I have been hiking the Rockies for 40 years, including some month-long camping/hiking trips staying in Banff and Jasper. We go to this area regularly.
As a pure opinion, we prefer hiking in Yoho (another poster mentioned this) and Lake Louise area along with hikes on the parkway. We don't care for the hikes around Banff as much.
Can't help with other activities. We don't do restaurants, bars, hot springs, tourist stuff. If we have a rain-out day to the point it's not safe to hike, we'll walk around Banff.