Follow the directions to Motueka (town close to Nelson). From Motueka it's only a 50 minutes drive to Takaka, Golden Bay.
1 km before entering Takaka, on state highway 60, you turn left to "Long Plain Road" (see brown tourist sign). After this turn follow the "Anatoki Salmon" signposts for about 5.5km till you reach your destination (easy peasy).
Anatoki Salmon signpost
230 McCallum Road, Takaka, Golden Bay, South Island, New Zealand
For exact location See Google maps in footer of this page