POR ( where we stayed last halloween)
Had some CM dress up. And little decorations here and there.
This was true for most resorts.
Boardwalk had a celebration Halloween night. I cant really recall what it was cause we were at the MNSSHP that night.
Each resort had a Pumpkin carving contest. CM's of certain areas from their resort carved pumpkins and displayed in resort main area. It was really nice to look at these. Very very creative.
I have some pics available at my site in the halloween section: