If you have kids, you have to go to Hershey for their Christmas Candylane. All of the kiddie rides are open, the younger kids are free and adults are only $10. We went the Sunday after Thanksgiving and the temps were perfect. Not too cold but just cold enough to want some hot chocolate.
This was our 2nd year and it was a lot more fun for Maddie this year because she could actually ride a lot more of the rides.
And of course you have to visit Chocolate World! Maddie enjoyed the ride because there was lots of singing and there were cows... and Mommy liked the free chocolate at the end :-)