@Elena, we are headed up there this summer and here are a few things we are doing:

Mt. Assiniboine over 3 days from Sunshine to Mt. Shark.

Kayaking on Lake Magline in Jasper

Day hikes including Wilcox Pass, Bald Hills, and Bow Summit Hike. There seems to be a ton of fantastic day hikes in the area so you can't go wrong.