Six Flags is a great place for family fun. They have some great roller coasters and if you go during the week or on an overcast or drizzly (not rainy) day you can actually avoid the major lines which helps. They do have passes you can purchase that allow you to move to the front of the line on some rides which, if it's crowded, are a great investment. Be prepared to take a hit in the wallet though! Also, there is no water park like many of the other Six Flags parks.
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