I'm jealous you got to play with water balloons, they are a great past time memory for me. I liked your idea for the fun thing you were suppose to do, it shows lots of creativity and I am sure it helped get your creative juices flowing.
What if instead of playing with water balloons you went paintballing instead, I feel that there were some parallels between some of the games you played with the water balloons could transfer over to paintballing. You could maybe get a different perspective with paintballs instead of water balloons.
I wish you had a video for how the games went, It seemed very high intensity and an enjoyable activity to watch. I also wish you would have added more connecting lines between some of your ideas on your mind map. I saw some that could have been connected, I feel it would help show relations between seeming less unrelated ideas.