mclean creek when it opens. the store has proper showers and washrooms. ive never camped there but ive driven through the camping area. looks clean and kinda secluded. or, random camp. waiperous has a decent camp ground. no showers or proper washrooms but pretty secluded and quiet. sibbald creek/flats camp ground isnt far either. ive camped there. has secluded sites, but again, out houses no proper washrooms. these are the places ive been that area close to calgary. there are other similar places in the bow valley near canmore. there are a few other camp grounds that have stopped letting people with tents in. im not a fan of this. they make more money from the RV crowd.
i found a lot on google. depends how far you want to drive.