Would love to help out any way I can. Much of this area is my backyard. I'm excited for you and your family to experience the area. What is your route coming north and then whats your plan for going back south? Might have some advice for both of those that might make a good route instead of back tracking. Their is a new skywalk along the parkway called Glacier Skywalk if you google it.
Mosquito Creek is a great campground along the parkway.
From canmore, head up to spray lakes (742), head south on the 40 and you can stay on that down to Blaremore but its all gravel and lots of boon docking along their or you can run to Longview and head south on the 22x (paved) to Lundbrick. Take the short jont into the crowsnest pass and see Frank Slide. From here you can hit forestry roads down towards waterton or take the #6 south to waterton. If you can't get a site there, their are many provincial parks. Payne Lake next to Mountian View has some good spots. Worst case you park at our house
we are 45 min from waterton.
From Waterton, you take the chief mountain border crossing (still #6) down to st. mary's and over going to the sun road to west glacier. Tons of hikes in Glacier Nat. Park.
Anyway thats just a quick run down of a route but let us know where your crossing into canada and where your want to exit.