Marble Races with a cheap pool noodle (occupies the kids for hours.) Did this, but instead of cutting the pool noodle, the marble is small enough to fit inside the full noodle to roll down. Then can use the noodle for other things too!
Water Balloon Target Practice
Water Balloon Activity for Kids: Water Balloon Target Practice. My kids are obsessed with water Balloons.
Laser Beam Challenge - Set up a laser obstacle course in a hallway with crepe paper. The crepe paper will tear if the kids bump into it, letting them know they weren't able to get through the course. For added fun, do this in the dark with glow sticks!
Fun and simple game for kids - Cafe and Apothecary Game and Puzzle Week
Do you have a boy that gets bored? Check out this list of 25 fun Boredom Busters for boys! These are great craft ideas!
Easy and fun children's birthday game: give a cup with water to the person behind you, but you can only do so by lifting the cup over your head!
El hada de papel her ideas are so simple and practical!
Balloon car races and more.
How to Make a Leak Proof Water Blob (without tape! We did a blob last year. The kids loved it. And it leaked. I looked over how she does it (iron-genius! We added glitter to our water to make it a little more fun.
22 te gekke spelletjes voor buiten voor je kinderfeestje
water games for outside
Mud Run Birthday Party - Inspired by the Warrior Dash, an obstacle course for the boys. other boys party themes/ideas on this site as well)