I have a bunch of snapshots of my dad that I took back when I had a KODAK Brownie Instamatic. For some reason, I had a fascination with taking his picture when his back was to the camera and he was taking a piss. I grew up on a farm, so the idea of just whipping it out whenever one felt like it was the norm. I also detected a sense of enjoyment from my grandfather because taking a whizz out-of-doors pissed off my grandmother for some reason. It was probably because she was too "refined" to approve of such behavior. Also, I doubt she could have ever taken whizz out-of-doors in the bushes without peeing in her shoes.
Considering the average age of a duffer on the back nine, I'm sure most of them have enlarged prostates and have to pee about every 3 minutes. Poor buggers. Just as long as you are not leaving dead spots on the putting greens and are discrete, I think you're within your rights as a human being to take a piss in the breeze.