(besides the usual drinking and eating)
Get a wii console or an xbox or a playstation and get some fun party games like singing or dancing, it'd even funnier when people have been drinking
its nice sometimes just to talk and meet up with old friends and family. There doesn't have to be anything special to make a fun day.
Games, music, fireworks, drinking games, the sky is the limit, just have a good time, and live to see the new year.
Spin the Bottle baby! Or if someone has an iphone, download Truth or Dare. It is free and actually quite fun!
You can play games, dance, do little contests?