With only one week in New Zealand, you should focus on either the North Island or the South Island, rather than trying to see both. For first-timers, a South Island "loop" starting and ending in Queenstown is highly recommended. You could spend 2 days in Queenstown (the adventure capital), 1 day visiting the breathtaking Milford Sound, 2 days in the lakeside town of Wanaka, and 2 days exploring the glaciers (Franz Josef) or the stargazing hub of Lake Tekapo. If you prefer the North Island, you can start in Auckland, head to the geothermal wonders and Maori cultural sites of Rotorua for 2 days, visit the Hobbiton Movie Set in Matamata, and finish with the stunning coastlines of the Coromandel Peninsula. A week is just enough time to appreciate the dramatic scenery of one region without spending your entire vacation behind the wheel of a car, as New Zealand's roads are often narrow and winding.