Disneyland decorates for all the major holidays. Their decorations for Halloween were fantastic.
Not only do they decorate the streets, they also decorate some of the rides. I love what they did to Space Mountain (ghosts and spooky images flashing past as you ride at high speeds through the dark), but the kids really loved what they did to the Haunted Mansion. It's their new favorite ride now that it's dressed up as Nightmare Before Christmas.
I hope you were able to get into the Halloween spirit as well as Disneyland did.
Happy Halloween!