Well, you may want to hit Soak City on Wednesday. You will have enough time to do everything if you stay till close at 8 or 9. I am guessing that some of your children are under 48 inches, which means that you get a highly discounted rate. The three year old is free. You can buy discounted Soak City tickets at AAA offices in Ohio.
For the next day, I'd take a look at many of the websites around here. There probably isn't much though as far as a strategy guide for families with young children.
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