Kayak on Lake Mapourika with mirror reflections of the mountains

Take a jade/pounamu carving workshop ($85 NZD)

Heli-hike onto Franz Josef or Fox Glacier (3-4 hours including helicopter flight; from $400-450 NZD — expensive but unforgettable)

Walk to Lake Matheson near Fox Glacier for the famous "mirror lake" reflection of Mount Cook and Mount Tasman (free, 1.5-hour loop)

Walk the free Franz Josef Glacier valley walk to the glacier viewpoint (1.5 hours return)