It depends on what this resume is meant for. Is it to apply for a specific job position, or are you trying to ask whether you have a sufficient number of extracurricular activities to get into medical school?
If it's for a job, here are my suggestions:
It's far too long and fluffy. Two pages is about my limit on reading a CV, but yours is a very stretched two pages. You could easily combine all of your shadowing experience into one very succinct entry. Experiences could be grouped for easier reading (ex. grouping shadowing, grouping volunteer experience, grouping research, grouping clinical experience... perhaps with sub-headings). I'd delete the conference completely. Bring it up in an interview if it's important to you. There's too much listed under hobbies/interests.
I do, however, like the clean format of your resume and the basic organization. I've seen some real nightmare resumes where applicants go overboard with clip art, word art, and the such. I had one applicant recently who had so much word art that she failed to actually include her name and contact information. oops? Another decided to include inspirational quotes about her from those who have worked with her in the past. I kid you not. I personally like when applicants include their degrees, GPAs, and any kind of standardized test scores. I'm going to ask if it's not included. Some people don't like it to be included. It's a matter of preference. Just to emphasize though, all of this is my opinion. I'm not sure there is ever going to be a right or wrong answer. Anyway,
