The book is about a King who won't get out of the bathtub all day. Various people try to get him out by saying, there is a battle, a feast, a ball, to go to. But he insists on having them all in the bathtub.
As I read the book I knew exactly what activity we would do to compliment this. We would have our own battle in the bathtub with junkmodel boats.
Hublet and I found some instructions for making oragami boats and we tried our hand at it. These got very soggy in the bath and sank pretty quickly.
I made a melon boat (and ate all the melon - yum!). Goblin threw this in the bath a bit too enthusiastically and it sank making the sails very soggy. It floated once I retrieved it from the bottom of the bath and emptied out the water.
And these two ice boats were a hit but didn't last very long in the warm bath.
Goblin enjoyed the battle in the bathtub so much that the next day he asked for more boats.