Thanks for the additional info.
I didn't watch it on TV so hadn't appreciated the lack of crowds. My only experience is the British Open and Ryder Cup and by Saturday the place is usually rammed at least tees and greens no matter who is playing the hole.
As for the media pass congrats on getting one from the GM. However with that around your neck you effectively represent or will be considered to be working media - at least for the day - and your actions attributed to pros - whether you are just there for fun or not. I'd suggest that it was fortunate that Tiger wasn't around - he is well known for going off one one even if he thinks he heard a shutter during the first part of his swing - Marshalls approval or not. Your actions *might* have had a direct impact on the other photographers working the course - who were relying on it to pay their mortgages.
If you are going to do this again it might be worth a read up around the normal etiquette...sportsshooter.com has a wealth of it.
http://www.sportsshooter.com/message_display.html?tid=29388
http://www.sportsshooter.com/message_display.html?tid=25549