Where to take my girlfriend?

I'm only 16 so take my gf to dinner isn't something that would seem natural for teenagers to do. I've thought about taking her to the cinema but she isn't giving me any idea on what film she would like to go and see and there doesn't seem to be a wide selection of movies playing at the cinema at the moment. Also there's hardly ever a time when either of our parents and or siblings are out at the same time so can't really have her round mine to watch a dvd or whatever so i'm kinda stuck on where to take her. Any ideas?