I would even consider dropping some of planned four official tours. Four presentations and tours is a LOT in that time frame. I do think walking around the campuses is great, though, and would encourage you to include some others in that.
What kind of grades does your son have now? UNC Chapel Hill or Duke or Wake Forest would be fun to walk around, but if he has no chance then I don’t know if it’s worth it just to get his hopes up. If he might be interested in a really small school Guilford in Greensboro (just a hop and skip away from Elon) is pretty sweet. Lots more going on in Greensboro than in Elon, that’s for sure.
You understand that state schools in NC are required to accept no more than 18% of their student body from OOS, right? That’s what makes schools like UNC Chapel Hill and to an extent NC State hard admits.