My Birthday Party

I`m having my 13th birthday party this saturday. I`m having over 10 girls including me. Its way to cold to stay outside for a long time, but we may go out for a little bit. Some of my friends are tomboish, and I sorta am. I don`t know what games to play with my friends. I know what food were having and what the "theme" is. I just can`t think of any games. Please help me. Remember were 13!