Welcome! Yep, there should be plenty of Halloween stuff onboard. My BF was on the Wonder the week before Halloween 2010. She said there was trick or treating, costume contests, Nightmare Before Christmas on the Ariel View TV, Halloween dance parties. That's the main reason we booked this cruise. We have cruised in late Nov through mid December 3 times, and we love the Christmas decorations onboard. In fact, we are a bit sad we won't see them this year, but can't wait to see Halloween, and we're going on the Dream!