Don't set it in a haunted house.
Don't set it in a forest.
And then you'll be right.
Basically, with the creative writing task for this topic, it's going to be easy for you to fall into cliches.
Be original in setting, characters, plot, but don't be too subtle with the Romantic elements in the composition.
At some point, you'll find that perfect balance. Until then, just write as much short stories as you can. And then you'll probably need to find more plot/character/setting material, as a back-up plan if the exam question doesn't fit your prepared response.