One thing that I didn't think about when I was looking at schools is whether they are on a semester system or a quarter system. I think most schools are on semesters now, but I ended up at one that wasn't and hated it. Now, being at school on semesters, I realize how significantly different my education would have been.
Read the paper for the local town/city and get a feel for the area or neighborhood. Not only can you get the dirt on relations between the school and the town, but also find out about activities and services. Even flip through the phone book while you're visiting or go online.
For example if your kid has a medical issue is there a doctor that specializes in it, and if not is there a traveling clinic for a rural area? You can also read about crime off campus which certainly affects students. Also look at the housing dates because sometimes there are extra fees for staying for part of a break even if a student is required to be there for an activity, or housing shuts down completely and you need to make other arrangements ahead of time.