Need Help Fast!! What could my characters find in a creative writing story?

I'm writing a story about three sisters, and the youngest is obsessed with finding Santa Claus (the other two are sarcastic and witty, don't believe but follow). I will front load the story with hidden info once I know the answer to this question: When they are looking for Santa, what do they find? I don't want it to be related to Santa but something that is interesting that I could continue and be a shocking moment. Thanks!! Please answer soon!!