Get enough time in clinical settings so that you:
1. Have multiple stories that are too disgusting to tell at the dinner table because they involve body fluids or a pannus
2. Have questioned, multiple times, whether you'd actually like working in healthcare, because of things you've seen/heard/done
3. Have observed other disciplines in action, such as management, device sales, biotech, because getting into those fields won't take another decade
4. Have had more than a casual conversation with several people along the medical training pathway: med students, residents, fellows, attendings, oh-so-close-to-retirement-docs
5. Can have insightful conversations with health professionals that start by asking questions that you have no idea are important yet
Or do it like the kiddoes and make sure the hour count is 3 digits long and includes 3 or more settings.
Best of luck to you.