1 well you can always get back a ways and shoot the stream from a distance... but then you run the risk of splattering the mirror.. which if its not yours then it doesnt matter...

2 Sadly, however, many of us are too short to reach the sink with our tush unless we hop up and actually sit on the edge. At best, the chance of falling in makes you tense up and then... no pee. At worst, the sink is one of those cheapo attached-to-the-wall-with-old-chewing-gum types like they have at... oh, say the stadium, and it comes crashing off the wall in a flood of broken pipes and there you are with your thong around your ankles trying to run away and pull up your jeans at the same time and what the hell are you looking at, lady? Or so I've been told.

3 Don't know about sinks, but here's a handy technique when the ladies' room line is around the corner and up the stairs: http://www.restrooms.org/standing.html

4 I've found it best to just shoot straight down the drain hole. As long as you hit the sides of the pipe before the water level in the bend, it won't splash back. Plus, it is a great way to practice your control so that your snow-writing skills can improve even during the off-season.