Applying summer 2014 with virtually no active clinical experience or shadowing is a bad idea. Another advantage of waiting a year would be the potential improvement for your GPAs, if you can earn a lot of A grades, and the opportunity to add more ECs that would benefit your application, like nonmedical community service, leadership, and/or teaching.
I will further add that applying with just one summer's worth of clinical experience won't do you any favors either. I strongly suggest that you find a local medical facility that welcomes volunteers, where you can start now and return next fall. Consider hospitals, skilled-level nursing homes, clinics (family-planning, low-income, VA, private), rehab facility, inpatient Alzheimers unit, hospice, etc. The average applicant lists 1.5 years of clinical volunteering for a total of 150 hours (duration being more important than number of contact hours). Others gain experience through the workplace.