13th Birthday Party

I`m a twin and me and my sister want to have a birthday party with 10 kids (4 kids each and us) we have the same friends and everything but we don`t know what to do for our party!!! We want to do something exciting that doesn`t cost to much and everyone will have fun!!! and also we can`t do a sleepover unless we invite only 2 people each or less, so we think we`re not going to have one. But please help us!!! We want something fun that everyone will enjoy but it won`t be too girly or too sportsy but just fun!!! Please help!!!