The boat is ready for launching. Just to see if it will float.
And it does float. Timothy thinks it will be a bit more fun if only he could push it around a little bit. Doesn't matter that he's not dressed for it.
And if one brother can do it, why can't the other? Right? That's what Jonathan thinks.
And girls can do anything boys can do. Right? In goes Amanda.
I'm going to assume that the boat is still floating in there somewhere.