Here's the thing: even aside from having to answer this question, you should apply to schools that you're interested in, and to to that, you're probably going to have to do some digging. Whether that be talking to students from various schools, getting tours, or poring over their websites, or a combination is up to you. I do recommend looking at their website, because that will tell you certain things that each school finds important.
When you browse their website, is there anything that really catches your eye as being interesting? For each of the schools that I was most excited about when I applied, I would start browsing their website, completely lose track of time, as I dug through all the information, and look up to see it was at least an hour later and I'd dug through just about everything on their site.
Med schools are kind of like people; each has its own personality, quirks, strengths, and weaknesses- and applying is kind of like internet dating. Both you and the school present an image of what you want the other to see you as, and based on that information, they decide if they want to date (interview) you. If you both agree, you're in a relationship for the next 4 years. Figure out what about the school makes you want to spend the next 4 years of your life with them. The combination of things that you like isn't necessarily going to be the same as the next person, and when you have to answer "why this school?" you'll have a genuine answer that will let the admissions committee see what's important to you as well. Compatibility is important, so don't just say what you think they want to hear, and if you've got no interest in them, don't wast your time with them.