The first day I would build
Give the city one clear route before adding extras.
- Start with Turtle Head Isle and Lake Tai while energy is high.
- Use Lingshan Grand Buddha as the natural reset instead of crossing town too early.
the easier plan is Turtle Head Isle or Lake Tai first, Nanchan Temple or Huishan Old Town later. 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 Huishan Old Town just because it looked close on a map.