If you are time-limited in Jasper, I would highly recommend getting an early start on your full day there. First, drive north to Pyramid Lake for "golden hour" photos of the lake and Pyramid Peak. Then drive SE to Maligne Canyon because the sun needs to be higher to get good photos in the very narrow gorge. I like Maligne Lake, but it is a very long round-trip drive, so I would reserve it for another trip (you will want to come back!).
Summer days in Jasper are very long, so in the PM, I would drive up Mount Edith Cavelle instead of taking the Skytram. Great views, nice short hike, fun road (if you don't mind switchbacks). Then drive the old highway south to Athabaska Falls (if you didn't stop there on your way into Jasper) for late PM golden hour photos of the waterfall and several easy hikes. Now it's time to head back to the campground for a big dinner--you will be hungry after all that hiking and fresh air!