The South Island is the largest of two major islands of New Zealand, the other being the more populous North Island. It is bordered to the north by Cook Strait, to the west by the Tasman Sea, to the south and east by the Pacific Ocean. The South Island covers 150,437 square kilometres and is influenced by a temperate climate.
The South Island is sometimes called the "Mainland". While it has a 33% larger landmass than the North Island, only 23% of New Zealand's 4.4 million inhabitants live in the South Island. In the early stages of European settlement of the country, the South Island had the majority of the European population and wealth due to the 1860s gold rushes. The North Island population overtook the South in the early 20th century, with 56% of the population living in the North in 1911, and the drift north of people and businesses continued throughout the century.
Tourism is a huge earner for the South Island. Popular tourist activities include sightseeing, adventure tourism, such as glacier climbing and Bungee jumping, tramping (hiking), kayaking, and camping. Numerous walking and hiking paths such as the Milford Track, have huge international recognition.
An increase in direct international flights to Christchurch, Dunedin and Queenstown has boosted the number of overseas tourists.
Fiordland National Park, Abel Tasman National Park, Westland National Park, Aoraki/Mount Cook National Park, Queenstown, Kaikoura and the Marlborough Sounds are regarded as the main tourism destinations in the South Island and amongst the Top 10 destinations in New Zealand.
This website will give you a brief guide for travelling to New Zealand South Island. Enjoy !