Sweet 16

Hey! I need some help coz i`m having a 16th birthday party but i dont know what theme to have.I need ideas quickly. There are about 16 people coming. It`s going to be at my house and it`s goin to be really hot `cause i live in Texas.I need some game ideas etc. And i need some entertainment but i dont know what to have.The party is going to be during the day which is kinda boring but i dont know what to do to get the party started. Please help.
Danniella x