Once described by Rudyard Kipling as the ‘eighth natural wonder of the world’, Milford Sound is a relaxing contrast to Queenstown. It takes a fair amount of time to get there but it's worth it once you're out on the water of the Sounds. Take a boat cruise or hire a kayak and soak in the magical blue skies, green mountains, crystal-clear water and tumbling waterfalls.
Alternatively, take a flightseeing tour of the Sounds, departing from Queenstown airport. To break up the trip, spend a night in Te Anau, and explore the local glowworm caves.
Caution: If you choose to self-drive, be sure to give yourself plenty of time as conditions varying greatly on this route, particularly in winter.