Ooh, we did a similar trip in summer '18! We love that area! We did the pink jeep tour in Sedona, I forget what the specific tour was called but it was awesome.
We really enjoyed Montezuma's castle. My DS2 did the junior ranger badge there too. Also along that route and worth the stop (if your not already going to these places while in Sedona) are the Chapel of the Holy Cross and airport mesa. A little north of Sedona is the must-see slide rock state park. We took a picnic lunch and spent several hours there.
Not specifically on that route, but south of grand canyon in Williams is one of our favorite places- Bearizona. We've been twice, we enjoyed it so much. If you are animal people, it is such a cool place. I believe there is another wildlife park near camp verde (closer to Sedona) but we didn't go there.
If I think of anything else I'll post again.
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Mama to DS1 Punkin (2/04) and DS2 Boo (1/09)