I'd definitely like to play around in the parallel time room, and be transported to alternate realities like in Sliders (did anyone else watch that show?)
No interest in the play room - what happens when you're in there and it changes back into a linen closet? They never did explain how that worked.
The lottery room, so far as I can tell, is merely another dusty old room with a secret passageway, so that one doesn't hold much interest for me either.