There is no one single magic extra curricular activity that will get you ahead when your application is reviewed. Admissions officers read every part of your application and connect all the dots to understand you as a whole student. If you have creative writing, I imagine they would expect a very well written essay to back up your creative writing claim, and they're going to look at the depth at which you pursued it, how long, outcomes, etc. in addition to your academic record, test scores, life circumstances, etc. As a creative writer, I'm sure you're well aware how powerful the art of storytelling can be, and your application is your story.
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