They have several playgrounds, but the huge playground named Fantasy Planet is the place to have fun (be it kids or adults).
Now, Im not suggesting you (adults) should play and spoil kids fun. But it is sure huge and fun (I tried it) *chuckle*
After drench by your own sweat, you can quench your thirst at the water-cooler nearby. If desperate to cool down, jump in the nearby lake! haha