17th birthday party ideas?

I'm having my 17th birthday soon and I need some pointers on a party. My birthday is on a Saturday during spring break so everyone is on their way home from vacation. So the only people who would come would be my mom, brothers, my brother's wife and 2-year-old, my sister and her husband with 2 kids under the age of five, a 12 year old with her mom and 3-year-old sister who happen to be my cousins.. What on earth should I do? I didn't have a sweet 16 so I want to make up for last year by having a sweet 17.