Our family recently spent three days and two nights (Wed-Fri) at the Kalahari  Water  Park  and Resort in Sandusky , OH 
I won't compare the other resorts to Kalahari here, for a couple of important reasons – 1) we spent more time in Kalahari, and 2) the more we've been to water parks, the more we have learned.
Let's run through the process and features, and along the way I'll provide our opinion.
Online Booking
The website is ok to use – not super simple, not overly complex.  Being the bargain hunter I am, I naturally sought out the deals section.  This part can be confusing – for the same dates there are multiple packages available, and it's not always easy to see "value" in the choices.  
Locating the right resort and booking the dates was pretty straight forward.  You get a quick confirmation of the booking automatically once you complete the process.  
  
 
 
