Keep in mind that medical schools WILL want to talk about your ECs if you get an interview, so doing something purely for the value of it looking good to them is kind of stupid.
Interviewer: So, I notice you volunteered at a free clinic for six months. What made you do that?
You: I thought it would look good on my applications.
Interviewer: Nice honesty. But no.
or, alternately:
Interviewer: What was one thing your involvement with the LGBTQ group on your campus really hammered home?
You: Everybody's different.
Interviewer: More specifically? Any changes in perspective, memorable events, etc...?
You: Well, the big thing is that everybody's different. Can we talk about my GPA and MCAT score? I'm more passionate about them.
Pick an EC you're passionate about and stick with it. Medical schools look for commitment. Get clinical experience, definitely, but keep in mind that it's just that: experience. Join a student group - maybe the debate team or a sports club. Find a place whose mission you love and who you WANT to contribute to. And if you find yourself thinking, "but that other club just seems so premed!", back up and look at how things will be at your interviews. You want to be able to talk about these things.
I may not have the longest list of ECs, but mine say a lot about who I am. Have a look at some here:
Work with international/foreign students:
- English as a Second Language tutor (1 year)
- Worked at camp for middle school English students in Japan (2 months)
- Worked as a conversational English instructor in Japan (1 year)
- International Student Mentor (orientations/assistance) (Present)
Community volunteering:
- American Red Cross (4 years/500+ hours)
- Bone Marrow Bank representation (6 months)
- Give free information about organ donation (and DMV stickers)
Just from these two subheadings, what can you tell about me? Yeah. I ended up with so many similar activities because I found niches I loved. I know it may seem counterintuitive, but if you love it, it will take you places.