I took the opportunity when in Dunedin to visit this cemetery, and was assisted by a really helpful staff member at the cemetery. I had looked up the records in the library, and found that Margaret SMITH and James Smith VIAL were buried here. I just had to give the names and dates, and I received a map with the location circled, and directions on how to get to that section. Believe me, you need the directions - the cemetery itself is massive, and you could easily get lost.
However, I did find the grave, although the description (heart-shaped marble stone) was a lot more helpful than knowing the inscription and looking for the stone. The inscription itself is barely readable. However, it is in a lovely place, on the side of the hill. Well worth a visit.