What Do I Do?

OMG! I am turning 13 in September and I don`t know if I`m too old to be having a party, but I love my friends so much and I just think it would be fun one last time for my first teen year. I have no clue what to do, and only so much time to think. I don`t want it to be too cheesy and not too girly because I`m not that girly. So help me out here, what should i do for my 13th birthday?