A water slide (also referred to as flumes, water chutes, or hydroslides[citation needed]) is a type of slide designed for warm-weather or indoor recreational use at water parks. Water slides differ in their riding method and therefore size. Some slides require riders to sit directly on the slide, or on a raft or tube designed to be used with the slide.
Some slides are designed to be ridden with a tube which typically seats either 2 or 3 riders inline. Similar to a traditional body slide, these slides include many twists and turns and come in a variety of types including bowls, funnels and half-pipes.

https://en.wikipedia.org/wiki/Water_slide


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Note added at 14 mins (2016-02-25 22:33:43 GMT)
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You don’t have to be crazy to ride the new water slide at Schlitterbahn Kansas City, but it probably doesn’t hurt.

http://www.nbcnews.com/feature/carry-on/10-new-water-slides-...

Riders then encounter the open-air twists and turns of this thrilling water slide before splashing down into The Current.
http://www.atlantisbahamas.com/thingstodo/waterpark/watersli...

As an option, SPLASH DOWN WATER RIDES, but I think RIDE is more universal. (same link as above)