OA5II,
Not only is it proper, but expected and necessary. Your son needs to reach out now (as 2014) to get their attention. Tell them you will be on campus on X date, and would like to schedule time with them. This is an unofficial visit, so there is flexibility on both sides.
Totally, 100% agree with RJM on this one. You'll most likely want to broaden your search to include more schools. You'll increase your son's chances with more exposure to more schools. Depending on what your son's criteria is, we found the easiest way to add more target schools was by expanding our geography. We worked with an initial target of 50 schools that quickly got narrowed down. Not every school is going to be interested nor is your son going to be interested in every school. That is the process. As you find good fits, do your due diligence and come back to HSBBWeb with questions. You don't have to mention the school's name.
http://nces.ed.gov/collegenavigator/ - College Search Tool using many variables.
http://www.boydsworld.com/ - Listing of Colleges by Division
Good luck!