Hey Johnlin--
1. ASK. Most docs that I've talked to are really receptive to having someone shadow them. I asked my family doc if he knew anyone I could shadow, and he suggested that I shadow him, and it was an unbelievable experience. I was incredibly lucky b/c my doc just happens to be a preceptor for Duke and UNC first-year med students, so he did the same things with me that he would do with an med student. He also told other docs that I was shadowing him, and they asked me if I wanted to shadow them! Unfortunately, I don't have the time to do this, but it was incredible. All you have to do is ask-- ask your doctor, or find a specialist you're interested in and if they aren't available to have you shadow them, then they probably could refer you to someone.
2. Leadership for a post-bacc...hmmm. Honestly, while leadership is nice, I don't think it's a requirement (I'll refrain from getting on my "there is no set check list or forumla for acceptance" soap box this time.
). In my opinion (for what it's worth), get involved with something that interests you, regardless of whether or not it's medically related. You'll be a much more interesting candidate if you're enthusiastic about your activities rather than just going through the motions. If you're dead-set on finding some leadership activities, try mentoring, tutoring, volunteering with your church (or whatever-- just an example) youth group, volunteering with a local civic group-- whatever. Once again, the important thing is to find something you're genuinely interested in. It makes you happier, and you'll be a better leader.
Best of luck!