Travelling for a 2nd time and need help with Itinerary – 24 days

As the title suggests, I’m heading back to Japan this September/October, but I’m struggling to decide on the final part of my itinerary for booking my hotels.

On my previous trip, I visited Tokyo, Hakone, Kyoto, Nara, and Osaka. This time I want to explore a few different regions, but I’m unsure whether some of my current stops are actually worth it for my interests.

Last time I tried a mix of activities:

  • Hiking / nature walks
  • Exploring cities without a strict plan
  • Retro game shopping
  • Museums
  • Zoo
  • Hot spring

What I really enjoyed most:

  • Nature walks and scenic areas (for taking pictures)
  • Wandering through cities and neighborhoods
  • Retro game hunting

My dilemma

I’m currently debating whether it’s worth staying in Nagoya and Okayama, or if I should:

  • Skip one (or both) entirely (wasting time on checking-in and travelling to hotels)
  • Reallocate those days to other cities
  • Replace them with somewhere more aligned with my interests

I also briefly considered Hiroshima, but I’m not sure it fits what I’m looking for beyond the obvious historical sites.

Current itinerary

  • Day 1 – Arrive in Narita Airport (recover from jet lag)
  • Day 2–4 – Tokyo
  • Day 5 – Travel to Nagoya
  • Day 6–7 – Stay in Nagoya (maybe a day trip to Takayama)
  • Day 8 – Travel to Fukuoka
  • Day 9–12 – Stay in Fukuoka (day trip to Nagasaki)
  • Day 13 – Travel to Kumamoto
  • Day 14–16 – Stay in Kumamoto (mainly for the One Piece statues)
  • Day 17 – Travel to Okayama
  • Day 18–19 – Stay in Okayama
  • Day 20 – Travel to Osaka
  • Day 21–23 – Osaka
  • Day 24 – Depart from Osaka

What I’d love input on

  • Is Nagoya worth 2 nights, or should I reallocate those days?
  • Same for Okayama — good base, or skippable?
  • Are there better cities for nature, exploring, and retro games that would fit into this route?

by Substantial_Gap_4312