The Kerry Hotel in Shanghai created this million-ball ball pit by filling an 82-foot x 41-foot wide (25m x 13m) swimming pool with green and pink balls to raise awareness for breast cancer prevention (get those titties checked, ladies). I could spend all day Scrooge McDucking it around in that pool. Well, provided no kids already peed in it. Why do kids pee in the ball pit anyways? SPOILER: Because I was just so excited to be in there.
Hit the jump for several more shots of how I want to spend every afternoon (although mine would need a deep end for diving).
Thanks to Marc, who agrees a nice ball pit beats the shit out of a snake pit any day.