Robert, I live in Wellington, and will unlikely be in the South Island or Otago while you are there. My suggestions, based on what I understand are the sort of photos you take, are the Catlins, a coastal area south of Dunedin, the road from Balclutha to Alexandra and the McKenzie Country.

The Museum in Dunedin, in the main 'square' (called the Octagin) is worth a visit.