There aren't a lot of non-MNSSHP Halloween based activities, but there are some.
Many of the resorts will have carved pumpkins displays in their lobby (designed by the different staff departments and guests get to vote for their favorite).
DTD might have some decorations up (no trick or treating).
FW tends to have guests that decorate their camp sites.
I've also read that the Boardwalk does some Halloween activities.
You'll see some guests dressed up, but not many because AK, DHS, and Epcot still enforce the rules about costumes.
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