Enough said. No, but really, edible chocolate slime is another fun slime that you can feel safe letting your kids play with (and eat)! Did you see the Edible Starburst Slime I shared earli (Diy Slime For Kids)
SCIENCE FOR CHILDREN-Having already done this, it was a great addition for sand and sensory for even toddlers. Developmentally appropriate for children of all ages depending on what is added. Will abs (How To Make Slime With Flour)
Glow sticks in the pool, great for night swimming! Not sure this would be the best idea for a big in ground pool (would probably take a couple hundred sticks), but would definitely be cool in a kid pool or an above ground pool!