Valley Fair is a great place to take your family, there are lots of fun rides, a water park included in normal admission, great parking situation, can get discounted tickets by going later in the day or looking online for promotions. Even without discounted tickets it is a reasonable price. Season pass is a great deal, you get free admission to all other cedar fair parks such as Cedar Point (the very best park for roller coasters) also if you get your season pass early in the year it is very cheap
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