We use a sensory table activity at each Little Lab session. You can use almost any container, sink tub, etc for hands on exploration. But, if you are into the DIY spirit, here's a plan to make your own.
10 MORE (Almost) Effortless Waiting Games for Kids | A follow up to 10 (almost) Effortless waiting games for kids. More great ideas for passing time! - we usually do Eye Spy .. so, maybe we can do something else. :)