Marble Races with a cheap pool noodle (keep kids occupied for hours.)
You'll never have to buy another gift bag after learning this.
Balloon Ping Pong - great for rainy days
Moon Sand - mix together 4 cups sand, 2 cups cornflour, and 1 cup of water. Oh my! Who knew you could make it!?!
Once made, they can be saved each year and then a new glow stick can be added inside. The kids love flying these around the yard at night! Could be a fun camping craft
This is genius!! Portable roads that are easy for kids to put together and will travel easily, made out of old denim and yellow paint; velcro helps them stick to carpet.
Life-size Kerplunk game (with instructions). NO WAY! how fun would this be up at the lake!!
Stress Relief kit
Sponge towers- cheap and quiet
Flashlight? How come I never thought of this as a kid?!