I am desperatly seeking some social club ideas, tomorrow I will be sitting down and putting together a list of social club ideas for all the major holidays for the remainder of the year but I am kinda stuck!

Please, any suggestions are welcome, I am after activities for all ages (I manage a caravan park so things we can do at the park without venturing out)

I have ideas along the lines of:
Trivia Night
Movie Night
Treasure Hunt (although I really have no idea how to do this)
Pizza Night
Tug of War
Christmas Present Toss
Cooking for Kids

What are some more of those summer camp games you see in the American movies?