Perhaps games like Pictionary or Charades; light dancing, or, as you said - just hang out and enjoy each other's company. Good luck!

Basically, a few of my friends will be moving away after this school year is over with so i decided o throw a small party, nothing big just for one last time to hang out with everyone. There's a total of only about 16-18 people coming. We're all about 16 or 17 and I wanted to know what type of things would be fun to do? Anything will help :) Thanks.