Sounds like a great plan to me. Taliesin is interesting. I interviewed to be a guide there during uni:) Wish you had time to hit Casa Grande or some other indian ruins (the best are in northern AZ). Maybe next time.
Highway 1 is great, but check the weather beforehand and try to avoid it at night. I remember the fog and boulders to be pretty scary when I drove it. Hearst’s castle is always worth a visit if you have the time.