Party Themes, Games?

Hey guys!
Okay, I am having my 12th birthday on July, Friday the 13th.....everybodies going to get there around 7 and then later at night we are going to go to the drive-inn theater. We are all going to spend the night in the tent and I want to make sure that it was better than my other friends birthday party. The thing is, is that I have no idea what kinds of games to play at my party. I dont want anything innaopropriate but i dont want it to be too goody goody. There is going to be all girls. 6 girls to be exact! If anybody has any good party ideas or theme ideas PLEASE reply!!!!! I want my party to be better than anybodies!!!!! :)