This post has a water themed Birthday party including this relay: The first kid starts with a full cup of water, then pours it over his head and the second kid catches it and repeats and they keep doing this to see who can fill up a jar the fastest.
32 Fun DIY Backyard Games To Play (for kids & adults!)
Rainforest Jungle - in middle school our entire grade level did this, but on a larger level. All the students created things to decorate an entire room. Seems silly, but I still remember the feeling of being surrounded b