I feel like in mine and Coper's world, before the humans were brought back, their ghost would just hang out with each other and have random chit-chat.

Davie: so... Anyone do anything interesting today?

Elizabeth: I scared the crap out of some tourist and found it funny... does that count?

Joan: I say it does.

Fritz: Someone made Gilly upset so I spent the afternoon haunting them.

Nicholas: Sounds interesting.

Anastasia: I didn't really do anything...

Davie: I'm pretty sure only Elizabeth and Fritz did. Cause you know, when your a ghost, there's really not much to do other than spook people...