Depends on where you live. The year before mine put a bunch of cows up stairs. I’ve been told that the cows can walk up the stairs, but not down. My year filled a hall full of balloons, but it was kind of lame. One was to barricade all the main entrances with desks and tables stacked up to the ceiling. I’ve always thought it would be cool to sand-bag an area of flat tile and fill it full of water and put fish and frogs in it. Maybe a little un-realistic, but I think it would be awesome. :) Good luck.