Divide three days between the river, former-concession streets, and contemporary art or design. Stay in one walkable neighbourhood if possible.
Walk one district without a target
The lane houses, small galleries, and coffee shops are most useful as a sequence rather than separate pins. Pick an area and let it unfold.
Use the river at the right hour
The Bund is busiest at obvious times. Early morning, a grey afternoon, or a later evening can offer a calmer relationship with the same view.