And the original MacKinnon?
Apparently a man who ordinarily preferred to keep his own company and as a result lived in and wandered about in the bush around lake Te Anau.
McKinnon probably came to the area as part of a group of recent immigrants who were fascinated with finding a certain yellow metal that had a special value to them. The metal was well known to the local people who considered it curious but useless because it was too soft to be of any practical use.
The metal wasn't found in enough quantity in this area and so most of the people who came looking for it moved on while McKinnon chose to stay.
The land to the east of lake Te Anau was relatively flat and so a few other people stayed, cleared the land of it's natural vegetation by burning huge swaves of it, planted grass and started farming sheep that they had also brought with them.
The land to the west of the lake was considered too steep to be of any value and so was left in it's natural state. This land now forms Fiordland National Park at over 1.2 million hectares. This park is the largest in Aotearoa New Zealand and comprises around 5% of ANZ's total land area and is one of the largest national parks in the world. As an example of it's size, the two largest national parks in the USA, together, easily fit within it's boundaries.
McKinnon, as stated, preferred his own company and so he stayed on the western side of the lake and wandered around this area.
The local people considered the weather in the area too extreme (average 7 metre rainfall, high winds and snow in Winter) for permanent habitation and so tended to visit during the summer and they had extensive trails in the area that they used while gathering pounamu (greenstone or Jade), particularly Takiwai, a translucent form of Jade. Takiwai was found near the mouth of Piopiotahi (Milford Sound).
The Scots, of course, were quite at home in this sort of weather and so they cleared the flat land for sheep.
Cook is generally considered to be the first European to visit Fiordland and spent 5 weeks exploring the fjords in 1773 and mapped the area. These maps eventually attracted sealers and whalers to the area and the first European settlement in Piopiotahi Milford Sound housed these people and others who came to service them.
The seals and whales in the area were quickly slaughtered and the people who sort them moved on but the beauty of the area caught the eye of a few people who stayed.
The steep sided, deep, glacier carved fjords form superb natural harbours and so Piopiotahi Milford Sound became a minor port and supply staging point for the sealers and whalers as they moved further south seeking their prey. An interesting (perhaps) side point is that the fjords in this area are such great, remote, natural harbours that from time to time US and Russian nuclear submarines are said to shelter within them.
As the population of Aotearoa New Zealand grew with more and more immigrants from Europe the government of the time started looking around for slightly more sustainable economic activities than the extractive activities that first drew people to the area and so tourism was considered.
At the time, Donald Sutherland and his wife owned a boarding house in Piopiotahi. Meanwhile, back in the UK the very rich (and mostly idle) upper class had developed a penchant for visiting the Great Wonders of the World.
The Sutherlands decided that there was more money to be made from hosting the rich than there was from the sealers, whalers and sundry hangers-on and so started promoting tours to "Milford Sound".
They had some success but because ANZ is close to the antipode of the UK (point of interest, Spain is the actual antipode of ANZ and nearby Arthur's Pass is the antipode of Santiago de Compostela) it is a very long way to travel for people from the UK and so the tourism venture wasn't as successful as the Sutherlands hoped.
Undeterred, Donald Sutherland decided to go find some additional wonders for the rich to see and went exploring with a friend. While exploring the headwaters of the various rivers that flow into Piopiotahi Milford Sound he "discovered" and named the Sutherland Falls which he described as easily the tallest in the world at half a mile high.
At that stage the only other European to see the falls was Donald's friend and he was disinclined to correct his mate and so Sutherland promoted the falls to the ANZ government as a sure fire, international tourist attraction. In reality the falls are 580 metres tall but are spectacular and are the highest falls in ANZ.
Sutherland, with government funding, developed a path from Piopiotahi Milford Sound to the falls. This increased custom for the Sutherland's guest house. However this also brought surveyors to the area and they quickly dispelled the idea that these falls were the highest falls in the world and so the initial jump in rich customers soon tailed off again.
However, the falls combined with the natural beauty of Piopiotahi Milford Sound did attract a steady stream of tourists to the area. Ever the entrepreneur and with the government having already sunk a considerable investment into attracting tourists to Piopiotahi Milford Sound, Donald convinced the government that having overland access to Piopiotahi Milford Sound in addition to the existing sea access would further increase tourism and so the government offered £20 to find an overland path to Piopiotahi Milford Sound and chose MacKinnon to search for the access because of his knowledge of the area.
On 17 October 1888 Quintin McKinnon and Ernest Mitchell "discovered" MacKinnon Pass and blazed a trail from there to Sutherland's track that lead to Sutherland Falls and so the Milford Track was born. Sometimes described as the "finest hike in the world".
As a footnote, it seems that various people including McKinnon chose to spell his name in various different ways, see
https://teara.govt.nz/en/1966/mckinnon-quintin-mcpherson