We visited both Wake Forest and Elon in one day when DD was the same age as your son. They’re so close to each other it was pretty easy, spent the night before in Winston-Salem. We drove on to Durham the night of the visits, not much else to see in Elon proper. They’re both suburban, fairly compact campuses with welcoming presentations and it wasn’t overwhelming.
We also visited UVA, W&M, Duke and Va Tech on the same trip and I wouldn’t recommend trying to see any of them in half a day. DS and I visited Richmond and W&L the same day, but stayed in Lexington for two nights. We rushed through the Richmond tour since it was a haul over to W&L. Both kids ended up at Wake Forest.
I would caution you not to see too many schools on a trip. They all run together after a while and the kids get overwhelmed. Parents experience visits in a different way from teenagers, especially when they are younger and don’t really understand the admissions process. Some of the presentations scared our kids, made them obsess over their ability to get admitted.
I also agree about throwing things in to lighten the load . We visited Old Salem, Monticello, and Williamsburg on the first big college trip, and it reduced the anxiety a bit.
Have fun!