Fox Glacier, spectacular views
Fox Glacier, much like its brother Franz Josef Glacier, is one of the few in the world that is still growing. While on the way to the glacier, there's a sign about 10km of the way down saying "in 1750 the glacier came up to here", so it used to be even bigger and more majestic than it is now. There is an hour walk to the base of the glacier and back, although they won't let you get as close now as there have been accidents and even deaths of people who want to touch the ice. There is also an hour and a half hike to a lookout from which there is a spectacular view of the glacier.