Adding Black Lights Idea
We have made a whale many times. The first time we used backdrop frames from a Christmas play. After that we built a PVC frame and covered it with black plastic. MUCH faster than the blow up, because you do not have to seal every seam. We put blacklights inside, fluorescent fish and sea stuff, opened sardines (smell), let kids taste sardines, and edible seaweed (and goldfish crackers)sprayed water, etc. Very multi sensory.