Wharekaiatua translates literally as god (atua) food (kai) house (whare). This may be the house that eats gods, or the house of food for gods. Either way, there is little that remains other than indentations in ground, over which a gable roof would have stood to make a dwelling, or storage hut.
At the cache co-ordinates you will find a sign.
(A) Note the number of minutes it will take to get to Port Jackson Camp Boat Ramp via Fletcher's Bay Road (Hint: 1hr = 60 mins).
(B) Count the number of words in the last (and only) sentence on the sign (Hint: words after the fullstop).
Climb to the top of the stairs.
(C) Count the number of step risers (Hint: a multiple of 10).
(D) Count the number of flights of steps as separated by landings (Hint: the first section up to the grassy bit contains 2 flights).
Take note of the animal induced terracing on the hill to the East.
Climb over the style, and look for an orange tag on top of a fence post with 6 numbers on it.
(E) multiply the two middle numbers together.
(F) add up all the digits.
EDIT: Orange tag appears to have gone - (E) equals 2 * (D), and (F) is the lowest prime number greater than 20.
Walk to the top of the hill (or not) and note the "kumara pits" which are indentations left as the remains of sleeping or storage huts.
Proceed to waypoint 2 at S 36° 28.262 E 175° 20.814.
(G) Count the number of distinct islands that are visible from here on a clear day (don't count rocks). If it is not a clear day, count the number of horizontal wooden railings apart from the top one.
The final is at S 36° 28.XXX E 175° 20.YYY where :
XXX = ((B) - (G)) * (C) + (F) - (D)
YYY = ((C) / (G)) * (E) - (A)
Note: The division is exact
While proceeding to the final, look out for plastic containers positioned by DOC to protect rare plants.
This is what you are looking for