This is one of those things I look forward to every year...and this year was no exception. The people watching and the debauchery alone is worth a few hours of your time. Heaven only knows what you'll see around each corner!
This year I ventured from our Skyboxes on the 16th hole and walked up the stairs to locate a posh sitting area chock-full of fun-loving people. (So now I'm looking forward to THAT next year too!) It was a *little* chilly this year and I loved it! I didn't even realize there were so many things going on above us!
As Lindsey said, the 16th General Admission gives you a totally different perspective of the event, and I would have to say that if you're going to the Open, you should check out how both halves get down. (Go to the Skybox first though...the unlimited food and drinks will wet your beak so you can go hang with the hooligans.)