Actually BEING one of the characters for a day would be fun. A friend of mine and I once instigated an impromptu Christmas show on an empty stage behind the gazebo. We even pulled people out of the audience to sing carols with us, and then commenced to tell them they were on Candid Camera. OK, so we were naughty, but we didn't get caught.
We also like to start the carolling on the rides:
On Fire-in-the-Hole, we like to sing "Chestnuts Roasting on an Open Fire", and for some reason "Rudolph" is always the one we sing on ThuNderaTion. Wildfire always hears our "12 Days of Christmas". It's always better when we can get the whole ride to sing along! Ocassionally we'll even circle back to ride something for a second time and catch the employees trying to get a song going. Are we the ones who started the sing-along train rides?