I was enraptured when I read the reviews already on this page.
In April I made the 1000 km journey to the bottom of the South Island. This is the real New Zealand, far removed from the city life that I endure in Auckland.
Most people travel to these remote areas by car, but if you are travelling alone, or feel that is too un-green, be assured that I toured the whole area from and back to Christchurch by local bus and train services. Because of the tortuous nature of the roads there I would recommend this as it allows you watch the scenery instead of the road.
From Christchurch there are direct bus services to Te Anau, Queenstown, Mount Cook and Greymouth, as well as the scenic rail link to Greymouth that I used.
From Te Anau there are several services to Milford which connect there with boat trips up the Sound.
From Queenstown there are bus services to Te Anau (for Fiordland), to Glenorchy and Wanaka (for Mount Aspiring), to Fox and Franz Joseph Glaciers (for Westland) and onwards to Greymouth.
For the more energetic there are walks on the Milford and Routeburn tracks that lead through the Fiordland and Mount Aspiring National Parks respectively.