If your college has a pre-med advisor, I would contact her. If not, ask the bio dept advisor if they have heard of any programs currently accepting applications.
There is usually opportunities to do research, and if you don't get accepted to one of the bigger programs, you can always contact professors on your campus about spending the summer in their lab. Look for info advertising research fellowships from organizations like the American Heart Association, and various medicine specialties.
Finding clinical opportunities really depends on your interests (and sometimes your contacts). You could take an EMT course or a phlebotomy course, and volunteer or even work in those areas. This is something that if you like it, you could continue part time during the school year. You can also contact a hospital about volunteering. Shadowing a doctor can be harder to hook up with, but if you really want to do this, ask anyone you can think of if they know someone who would be interested in letting you shadow them.
Classes can be had on most college campuses. If choose to take a class (rather than 2) you could probably still spend some time volunteering. USe this as an opportunity to spend the summer somewhere you've always wanted to live.