Cheap day dates for school dances?

k, so my bf took me to homecoming and went all out and bought the nice dinner and pictures (which cost around 20-30$) and now its time for sadies and its the girls date so girls pay for everything. i wanna go on a nice date and stuff but im really tight on money, i dont have a job, and my parents arent made of money either. i dont want to just not go cuz i already asked him and its a big deal, but i have nothing planned for the date or the dinner. i dont want to be as cheap as to get fast food for dinner, but i need some good cheap ideas.....for the day date that would last most of the day, and dinner.......plz help!!!