My Super Sweet 13?

I`m having my super sweet 13 party soon. I`m only inviting girls & there will be about 15-20 of us. I really have no idea what to do. I was going to rent a villa at a hotel but they won`t let us have that many people. I want to get a stretched hummer but I dont know what to do after that. Please give me some really good ideas. I need help. I don`t really have a price limit. Thankss :)