Time: 3-4 hr one way
Good information on the DoC site
From the Blue Lakes carpark, follow the line of the old Ball Hut Road alongside Tasman Glacier. Ball Flat is close to the historic Ball Hut site and offers superb views of the glacier and surrounding peaks. Take care, as the moraine wall in this area and along the road is very unstable. Sign your intentions at the Visitor Centre if you wish to stay at the hut, which costs $8 a night.