Help with what to at my 12 year old birthday party?

Hey I'm going to be turning 12 soon, but I don't know what to do for my party?! I know I'm going to have about 9-10 girls sleepover (DONT WORRY IM A GIRL..!) and I want do something sporty. Like me:) I don't want to go hockey skating, because I've already done that. I don't want to go to Life Time Fitness because I've already done that. My favorite sports are Soccer & basketball. I don't want to go rollerblading either.. all though I love it! I also want do some thing outrageous that no one has really done before? Help. Please.. thanks!:)