I take my own snacks when I go cinema.
Usually a salad, some babybel lights, some low cal crisps, a cereal bar and maybe some low fat humous and carrots or something.
As for frankie and bennys I'd take a look at their menu online and see what kind of things u fancy and go for something wise. By doing this u won't have to worry too much when u get there as you'll already know what's on offer x