Zip Line, Zip Line, Zip Line!!!! Any amusement parks near by? Those are always good. People can make a day of those coming or going and you can get a group rate. Same with the Dragon if people want to do that.
Silly Stupid Stuff:
Murder Mystery...always a big hit
Hotel Hallway Bowling
Corn Hole (Bags) Tournament (Love that idea!)
Spork Olympics
Kappa Olympics (we can make that up)
Area stuff like Biltmore, or other museums, a list of area things to do that people can do on their own for a day with a suggested route of fun roads to cruise
Local sporting events (minor league baseball?)
Track/AutoX/Drag Strip (heard a lot of good things about AutoX, I'd like to try it, but it's not as easy to put together as you might think...we got lucky!)
Something fun and lazy where people can gather and be silly. I like the idea of random outdoor games if the weather is good. Give out junky awards. That always goes over well!
Tailgate...have Jeff Bring the Skybar and his grill...we got rained out in Canton!
Firepit! Fire is always good!

Drinking games...canoe races?? Beer pong??

I'm sure I can think up a ton more, or I can look up a ton more!