1. Add grass.
2. I'd figure out a way to make the upper levels more accessible. Those long concrete ramps one after the other don't seem that efficient. Some more elevator bays, big escalators, and stairways that go up to the upper levels would be nice.
3. The Rockies put in a bar area that is standing room only and has like 4 or 5 bars. You pay 15 dollars for standing room up there, 6 of which is recouped in a bar voucher. Given Jays fans' behavior not completely sold that this is a good idea but I think making the Jays game a good place to go hang out in the summer time is a smart move. Could just expand the Flightdeck.
4. It's not very visually appealing. Just tons of concrete everywhere. I'm not sure how that could be remedied though.
5. Hang a Wild Card banner.