July and August are always really bad, but as a rule most weekdays are a teeny bit better. Which one? Well, you'd better hope whichever one you're going! Magnum -- you're right about the groups. They can really make the difference. To find out about those, just call the park and ask if any group is going to be catered on those days -- some days, there are 3-4 different ones at the same time!
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Disaster Transport '97 Crew
Iron Dragon '98 Crew