Need help finalizing days itinerary

Is this too much?
Any thoughts on replacing Matsumoto with Kanazawa or adding another day to one of these and take one out from Osaka?

Day Travel Flight to Japan (Arriving at night)

Day 1 – 4 Tokyo (4 days)

Day 5 – 6 Matsumoto/Kiso/Kamikochi (2 days) (Hire car to travel around)

Day 7 – 9 Osaka (3 days)

Day 10 – 12 Kyoto/Nara (3 days)

Day 13 – 14 Hiroshima/Miyajima (2 days) (Flight back to Tokyo)

Day 15 – 16 Tokyo (2 days)

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