Canyon Meadows Theatre isn't that far off from the C-train station. Cheap movie tickets, last I remember they were $5 each.

Fish Creek is pretty nice and also not that far a walk from the station of the same name. Good for a nice nature walk.

If you're willing to take the train further, there's a lot of thrift shops by Chinook Mall you can explore, and the Devonian Gardens downtown is a great spot to sit and relax.

How much time do you have and how much have you already seen? Have you seen Heritage Park already? It's one MAX teal ride away.

If I were in Calgary for a week and barely a nickel to my name, I'd look for viewpoints like one at Scotsman's Hill, parks with views like Lake Bonavista.