Venus - when at its most visible, i.e. at the greatest angle from the Sun, it is just amazing how bright it is! On a moonless night it casts an easily-discernible shadow.
Oh that's a tough one. I have two things I really, really like to do, and sometimes I do them both at the same time. Sex and rp. So yay! Win win situation.
Next category. Have you ever been sexual with someone of the same sex?
BMR, imgur, reddit, and a good RPG or back-to-back episodes of something sci-fi.
Now if it was an evening we were talking about it'd be more along the lines of parkour. There's just something deliciously visceral... predatory, even, about running the cityscape in the night.
Favorite way to distract yourself from an itch (be it literal or figurative) you know you can't scratch?