Great question. Ten years ago, I would've told you medicine. Five years ago, I would've said marketing. Writing this now as a twenty five year old who can't quite call himself a "recent grad" anymore, I'm not sure.
I love marketing- that hasn't changed. However, the last couple years have opened my eyes up to so many possibilities I hadn't considered back in school. Design perhaps? Storytelling? Business growth strategy? A combination of all three?
At this point, I'm leaving myself open to consider any opportunity that comes my way. I love my job, but know that self employment is the only timeline I can see myself being happy with. I guess only time will tell.