The first day I would build
Give the city one clear route before adding extras.
- Start with Mount Lu and Xunyang Tower while energy is high.
- Use Poyang Lake as the natural reset instead of crossing town too early.
the easier plan is Mount Lu as its own day, or Xunyang Tower and Gantang Lake for the city route. 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 Yangtze riverfront just because it looked close on a map.