Throw glow sticks in the bathtub and turn off all the lights during bathtime! WHY DID I NOT THINK OF THIS FIRST?
Marble Races with a cheap pool noodle
White shaving foam + food coloring = bathtub painting fun
COOL. 1/4" Mt Dew in bottle, add tiny bit of baking soda and 3 capfuls of hydrogen peroxide. Shake and it glows. Pour on sidewalk to "paint"...Who knew!? (another reason you should NOT consume this, or let your kids!)
Would this actually make little boys wash their hands more?