Disney puts up halloween decorations throughout the parks but like others have mentioned, if you are going to be in Disney World around Halloween try looking into Mickey's Not So Scary Halloween Party! It requires a separate ticket (BUT, personally, I think it's possible to just do the Halloween Party at night and not go to the park during the day, you can get a lot accomplished at the halloween party!). It's so much fun. Your kids would love it. I'm 22 and my fiance is 24 and we look forward to going every year. Happy planning and have a great trip! Send me a private message if you have any questions about the Halloween Party!