More to explore:
Glow in the Dark bath...totally need to do this sometime!
How to make your bath water glow and other totally awesome things to do with your kids. (No reason the big people can't do this, either)
Glowing water--HOW TO!
50+ fun things to do this summer that are inexpensive with kids
DIY Glow In The Dark Sprinklers- what a great idea for Summer FUN! My kids love anything that glows
Things to do at the beach!
101 things to do in the summer
40 Things to Do With Your Kids.