A BIG don't forget is the over door shoe holder, I got a few chuckles from my DH when I packed it, but he repeatedly said on the trip, what a great idea this is, so glad you brought it. Yes, I did rub it in.
Also, something I didn't bring that I wish I did were highlighters. When you read the navigator at night you can highlight all the things you would like to try and do, and then the next day you can see at a glance the times and see if you still want to do them.