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!
DIY Pattern Building Blocks: An Awesome STEM Activity for Kids!
"I was recently introduced to Keva Planks by a friend who is a teacher and always nails it when it comes to clever products for children. These simple wooden blocks are fabulously fun and kept my girls busy all Saturday afternoon.