My BFF And I Are Having A Combined Boy Girl Party-HELP!!

My best friend and i are going to have a combined 13th birthday party. We want have about 15 boys and 15 girls. We might have it in my basement, and play music. But what should i do if the guests get board??? should there be a theme???? and my friend and i dont dance like sluts, but thats how some of the girls dance, so what should we do then ????? and what are some good party favors?????