You and your child can each customize your own sailboat, then use your Easy Clean Bath Squirters to shoot water at your sail, and see how fast you can reach the island at other end of the tub. Last one there has to wear a silly bubble hat!
Or, do some “experiments” with size and weight. Once your child has assembled their Island Adventure puzzle, find different bath-friendly items around the room to place on top of it. Ask your child if they think the island will stay together, or come apart before placing the item.