With its dramatic peaks and dark blue waters that reach depths of nearly 870 feet, Milford Sound is the star of glacier-carved Fiordland National Park. The area's frequent downpours only enhance this South Island beauty, sending numerous waterfalls cascading down the cliffs. Charter boats, sea kayaks and scenic flights afford bird's-eye views. But the most intrepid nature lovers book in advance to hike the 33-mile Milford Track, a legendary route through alpine passes and temperate rainforest.