It has been bloody raining here for two weeks, but if you have a so called summer at your place you might want to get one of these: a Six Flags Banzai Falls Mega Racer.

The Six Flags Banzai Falls Mega Racer features a 22' long dual-lane waterslide which you and another can race down to see who hits the splash pool first.
The Slide inflates in less than 3 minutes with the bundled 13" blower motor. When connecting a water hose, the fun really starts.

Wal Mart sells you the Six Flags Banzai Falls Mega Racer for $349.88.
The complete measurements of your blow-up water park are 263.0 x 80.0 x 128.0 inches.