Walking the streets at night. I had a realization once I started walking frequently earlier this year. The awesomeness I attributed to big "better" cities than this one was largely due to the fact I would walk a lot while visiting them, i.e. NYC SFO CDG. It's amazing the mental benefit and happiness feelings that simply walking brings.
Oh ya and this would be a cool wall to do a night shot with music + art and stuff. Word?