More to explore:
Water balloon baseball - This is a great plan for a birthday party, but I'm filing this under Fourth of July ideas since all of my family has winter birthdays. Fun for the kids.
LOL this was exactly your idea!!! Water balloon baseball, water games, water balloon game, baseball birthday party, baseball themed party
Water balloon baseball - This is a great plan for a birthday party or summer fun.
Baseball Birthday Party - Water Balloon Batting Practice
water slide would prob take too long although it is awesome..This however is a must do!!