Ideas for fun Thanksgiving club dive???

We are doing a fun club dive weekend this Thanksgiving. I want to set up "something" fun and different. We have several teens and families with teens and really want something not overly "technical" but "totally" fun.

I was thinking setting buddy teams as part of two groups.. what else Pilgrims and Indians! Maybe a scavanger hunt?

What about a "treasure hunt" for objects for a cornacopia? Maybe some mini pumpkins, corn and gords.. something like that to be a centerpiece on the table? A prize for the winning team?

Any other ideas?