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!
Make this super easy Water Sprinkler for the kids using a foam pool noodle . plus lots of other fun pool noodle crafts. Have kids help you poke holes in the noodle and set it up! They will have more fun knowing that they helped to set it up!
Glow in the dark bubbles - open glow sticks & pour them into bubble solution. Link says it's hard to see glowing bubble. but it's worth a shot since they were using a glowing bubble solution not a glow stick.
Instead of Jell-O shots this would be great with watermelon jello and blue raspberry jello for Serve w/ canned whipped cream. XXL Watermelon Jell-O-Shots. How have I not thought of this? I think I need to try this for the this year.