We have a not long enough Spring Break trip planned due to DH's work

Kids will be 6 and 9 so plan some things knowing their stamina will dictate what we can reasonably do.

I have Sedona/Grand Canyon and Scottsdale (relaxing water park!) all planned and reserved. Will plan a couple of hikes, a Pink Jeep tour, and a day at the Grand Canyon. Would love to spend the night there but can't fit into our plans.

We arrive in Phoenix at night so will spend the night near the airport after picking up the rental car. What I need help in figuring out is what "fun" or interesting things we can do on the drive from Phoenix to Sedona?

We will leave reasonably early after breakfast to make the 2+ hour drive. I see Montezuma's Castle recommended. Any other kid friendly stops on the way? For the trip back down to Scottsdale, would you divert over to Jerome? Or would this not be interesting for the kids?