Boo to You parade is my favorite Disney parade of all time. It's amazing. The Villains Mix n' Mingle is also a lot of fun, because it's rare to see villains out and about anymore, so it gives you the chance to get a picture with one or two of them. All of the princes are out in Fairytale Hall with their respective princesses, which is also pretty rare, so we enjoy meeting them as well. And, the trick - or - treat spots are pretty great. They give out pretty good candy and it's easy to fill up a couple of bags before you leave, even if you just stop on your way to other attractions and don't go out of your way to find them.
Fall is my favorite time to visit and MNSSHP is so much fun! I hope you have a great first time!