There are a few things that I would change. I would get out more; too often I missed opportunities because I hesitated or just didn't know what I was doing. I would bring a backpack (especially the last day when I found myself loaded with materials and a five block walk back to the hotel). I would bring baggage with wheels. I would bring a pillow for the flights there and back (although I somehow managed to sleep for a couple of hours without knowing that I was doing so on the way back).
Hmmm... other than that, I can't think of what I might change. I had a great time and I met some great people. Heck, even the flight out was full of surprises. I met a family friend in the terminal who happened to be waiting for the same flight as me, and I was a seat away from the man who is in charge of the AP World History listserve (which I need to remember to send him my "bell-warmer prompts").
That said, it is so good to be home.