My personal feeling is that I would have loved to have run. I think days like this should be reserved for the amateur/novice drivers, since I think it would have been a good day to learn. So long as people don't push too hard or take it too seriously there's nothing wrong with a day like that.
I do think they should have been a bit more organised, I appreciate the casual nature of just letting everyone go but I think some separation of performance levels would have been helpful. When you've got cars that can corner twice as fast as other cars, or accelerate twice as fast, it causes problems.
Here's a link to an album with some of my (850!) photos. Apologies for the crappy resolution, next time I'm bringing a real camera instead of my iPhone.
Here's a couple of samples: