First, I emailed the radio station which I won the tickets through. Sorry, can't do anything about it. Alright. Next, I emailed the park directly. I got this reply:
Congratulations on winning your tickets! Please send me your two tickets along with a copy of this email to the address listed below and I will send you a pair of tickets good through June 30th.
Thank you! That is awesome. All I had to do was ask nicely. Holiday World has the best customer service of any amusement park that I've ever dealt with. I emailed another, much larger and well known parka question on the same day (Friday) and I STILL haven't gotten a reply from them. Another +1 for Holiday World!