Marble Races with a cheap pool noodle (occupies the kids for hours.) Did this, but instead of cutting the pool noodle, the marble is small enough to fit inside the full noodle to roll down. Then can use the noodle for other things too!
Looking for a new toddler activity? This one is fun, easy and engages fine motor skills - plus it's just cool to make your own musical instruments! Chelsea from /twotwentyone/ shares the step-by-step (Step Class Fun)