Termed as the ‘eighth wonder of the world’, Milford Sound is one of those unmissable places to visit in New Zealand. Surrounded by glaciers, the landscapes of Milford Sound is amazingly beautiful. The best way to explore the place is by boat. Explore the waterfalls and wildlife around the area on a cruise. You can even go for kayaking tour if you want. If you are already pleased by exploring the surface of the water, then you can go underneath the surface with a visit to the Milford Discovery Centre and Underwater Observatory. This is the only underwater observatory in New Zealand. You can go 30 feet deep into the water and experience a 360 degrees underwater view.