The first day I would build
Give the city one clear route before adding extras.
- Start with Kokura Castle and Mojiko Retro while energy is high.
- Use Kawachi Wisteria Garden as the natural reset instead of crossing town too early.
the easier plan is Kokura Castle and city food first, Mojiko Retro separately, Kawachi Wisteria only in season. That keeps the day readable instead of turning every good name into a separate detour.
I would rather leave one place for tomorrow than drag a tired route through Hiraodai just because it looked close on a map.