Ummmm, many people would have perceived the day as being negative and very poorly organized (e.g. 3 scheduling errors were made on my already re-scheduled interview) BUT I was fine with it. There were no school tours so McMaster remains a bit of a mystery. It was a long day (8 hours) so yeah, it was a bit painful (too much adrenaline for TOO long) but whatever....
What did you wish you had known ahead of time?
I wish I had been told that my interview time may be re-scheduled. I had important plans for apres interview that had to be 86d without notice.