Toddler and Preschooler
You need a bucket or buckets of water and sponges. We each had our own bucket. This is an outdoor activity!
Fill the buckets and soak the sponges until they are full of water.
Demonstrate to your children how to take the sponges out of the bucket (quicker is better but it doesn't matter) and throw them.
The sponges will SPLAT! After trying this numerous times, we found the higher in the air, the bigger the SPLAT. Water goes everywhere and leaves a great water mark.
Get sponge, soak up water in the bucket, repeat as many times as you want. My personal scale is if an activity is entertaining for 15-20 minutes it is a winner or if they ask for it later. This one hit on both scales.
Extension: We added chalk circle to the driveway and tried to throw the sponges in the circles. Our toddler spent most of her time taking the sponges in and out and squeezing the water in the chalk circles then yelling, "Look it!" and laughing.
Tip: Remove shoes if they can't get wet. Learn from our mistakes. Also wear a swimsuit unless they can get their clothes wet.