Well, you could always stay in tunnel mountain campground since you have never. Its pretty nice unless its changed a ton but I always enjoyed it. Really theres a lot of trail options but the bow river is right there and you can hike into banff from the camp, although I recall it being a little bit of scrambling, I think becuase we were down low. I think theres a good trail there. You can find a ton of trail ideas at the info desk though, they will sort you out in town.