The big issue with it is not so much designing the theming because a lot of the IPs lend themselves to a water park so easily like nintendofor example. It’s making a water ride that lives up to what they’re trying to sell.
Universal has some interesting patents for this.
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The Matt slides could project something in front of you or even be interactive.
A tank that fills with water before a drop could be themed to MIB:
You could have something like Popeyes which is basically a water park ride anyway with how wet you get.
You could add show scenes to a water coaster.
Or you could just go all out and have an inverted coaster with a shooter game attached: