Birthday...Help!

Hey! I turned 15 in July but my friend and i are going to do a late Birthday Party.. Well they`ll come in the evening and stay till next afternoon so it`s the whole night long!

Now we`re inviting boys and Girls at the age from 13 - 17

About 30 persons are coming!

We need good ideas what we could "play" at our party!
But we don`t want the little children ideas !
So it can be with kissing and so on!