I'm glad a few people stuck up for Hersheypark. I really like that place - if it's coasters you're after, they have as many good ones as just about anyone else - i.e. Comet, Great Bear, Wildcat, and the new Lightening Racer...
How much flexibility is there in your schedule? I agree with those that suggest you do Kennywood and Hershey, although Knoebels is supposed to be magic. And I've not been to SFKK, but haven't heard many good things about it. On our big coaster tour this year (14 parks in 21 days) we're gonna pass by SFKK - and skip PKI, perhaps our least favorite park - and head to Holiday World in Santa Claus, Indiana (a few hours west of Cinncinnati). It's not big, and doesn't have the number of coasters that those other parks have, but it is clean, pretty, with GREAT employees, absolutely NO theme park mentality, smaller crowds, and features one of the absolute best coasters in the world with the Raven, and have added an even larger CCI woodie this year with the Legend (a ride I'm looking forward to more than Millennium Force). And to top it all off, they do lots of little things - like, once you buy a soft drink, all your refills are free for the whole day.
So, you've got lots of options, and I'm sure more people will be posting their opinions in the days to come. But I'm sure you'll have a blast no matter what you decide.
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Age and treachery will always overcome youth and skill.