Whats wrong with home? I just attended a backyard birthday party last weekend that was so simple and cute. It was a Backyard Waterpark themed party for 4 year olds. They had 2 small, plastic kiddie pools filled with plastic balls to dive into. There were 3 larger plastic kiddie pools to swim in [various colors], plus a slip-n-slide and a water table.
The really cute part was the various water sprinklers they had setup around the backyard. At the swing set, they had one of those oblong sprinklers where the arm moves back n forth, so the water would sprinkle on the kids now and then while swinging.
They also had the type that turns in a spiral motion set up to play in and then a typical sprinkler that you stab into the ground that sprays in a stream, in spurts. They were all set up in different parts of the yard and they had a few beach balls and cheap, rubber balls located at each sprinkler setup.
It was one of the cutest and most original kid parties I have ever seen.

[This message has been edited by Kattx07 (edited 8/3/2011 8:23a).]