I'm excited to be there in 11 days!!
I believe you're driving the Parkway from Jasper to Lake Louise - prepare to have your mind blown - especially at the Columbia Icefields area. When you stand there and look at the surrounding giants (many of the Rockie's largest peaks are in the area) think "yo, John's climbed all these!"
DO:
Stop there. It's a fantastic area. Take your time on the Parkway - it's a jewel of a road that deserves time.
If you want a cool glacier experience, there is a guided "walk on the glacier" tour where you wear crampons and a guide takes you to look in crevasses and other cool stuff. It's a small independent business and they are awesome. Otherwise, do the Toe of the Glacier" hike and take some pics. Don't put so much as a toe of your foot on the toe of the glacier on your own - it's damned dangerous.
DO NOT:
Spend $30 on the STUPID "Glacier Skywalk." Horrendous waste of your time and money. It's a clear walkway over rubble.
Get gas at the Saskatchewan River Crossing (150km south of Jasper and 75km north of Lake Louise) - it's usually FIFTY TO EIGHTY CENTS PER LITER more than Jasper or Lake Louise. Not five. FIFTY.