Showing a relative around next week, and the plan is to not visit
anywhere I've been to before, unless more than 10 years ago. Driving
of course.

I don't know the roads in Shikoku very well, but will use expressways
where possible. Is the following realistic?

Leaving from Uji around 8am, drive to the Iya valley in Shikoku via
Awaji island. In the late afternoon/evening leave Iya and drive to
Matsuyama, checking in to accommodations around 10pm.

Next day visit Matsuyamajo, then car/ferry to Hiroshima, head down to
Miyajima and Iwakuni. Back into Hiroshima after dark.

Little bit of sightseeing in central Hiroshima, then back to Aichi via
Okayama or Kurashiki, arriving home pretty late.

And any suggestions, recommendations etc?