Well, a clean wang is a happy wang, right?
I went with #3. I like to do my business in private. I don't want conversation or some stranger pissing on my shoes (it's happened...) so I avoid the urinals like the plague I assume they carry. I use the stall and I close the door. It's just common courtesy. I don't want to see your package, I assume you don't want to see mine.
As for what stall...well, I always pick the handicap stalls. They're usually far away from the door, they're nice, roomy and for some reason always cleaner than the other stalls. I don't know if that's because they see little use and able bodied folks are afraid to use them or if they just do a better job cleaning up after themselves because they feel the plight of the handicapped. Either way, I don't care as long as they're relatively clean.
My roommate used to do
everything with the door wide open. It didn't matter what he was doing beforehand, he'd just carry on as if nothing was out of the ordinary. Eat a sandwich, talk on the phone, carry on conversations across the apartment all from his 'throne' in the bathroom. It's not that he had anything to brag about, he just didn't think it was a big deal.