Hi N.. Well maybe some water balloons could act like hand granades and they can pretend to bomb certain targets you can place in your yard. Whoever gets the closest to the target wins.
Same thing with the balloons: Make a maze of water balloons on the lawn and blind fold each child; they have to avoid stepping on a "mine" (ie: the water balloon). Whoever gets through the "mine" without popping the most balloons WINS! That would create lots of laughter.
Let me know how it goes. Hope this helps.
"helping moms work from home" Since 1985