I would try all the coasters, if time allows. But if you skip anything, IMO, skip Iron Dragon, which I consider to be the biggest waste of space in the park. It is a very tame coaster with a second lift hill in the middle that completely breaks up the flow of an already faltering pace. It's good for training the younguns, but that's about it. DO NOT miss Wildcat if you can help it - yes, it's a small carnival type coaster, but it does whip you around & change direction constantly, which is cool. Between Mine Ride & Corkscrew, I don't know, both have their points, but I would take MR, just because it's longer & if people are going crazy on it now, that's a plus. Anyway, just my opinions - hopefully you'll have enough time to try them all & form your own!
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CheapRock
Mount up & let's ride!