Recycle Jack's Carnival outside for a psuedo-Boardwalk. Then a boardwalk-inspired first room.
Comic book store with a Frog brother.
Could do two or three rooms of the cave--at least one better have upside down vamps.
Multiple rooms of grandpa's house. You know the bathroom scene will be one--we had what, four bathroom scenes last year? (Again, someone in Creative must have been a bear to potty train.) Maybe back yard set-up to start (been done many times, most recently for Halloween), finale in the living room with all the animal heads. Could work in a bedroom filled with 80s brick-a-brac with the kid vamp jumping out of the closet in there somewhere.