Big bend is a swell hike in Jasper. You could do this as a day trip or a short overnight stay. The trail starts at Sunwapta Falls which was nice for those of us that enjoy waterfalls. Since the waterfalls are a main tourist draw the parking can be iffy, so I would get there early if you can. There is an option to continue further down the trail but I do not think you can get all the way to Fortress lake anymore as the bridge was washed away. The hike to Big Bend Campground is a very easy trail and would be well suited to basically all skill levels. This trail would be a great introductory backpacking trail for kids or first timers.