If you happen to find yourself in Arthur's Pass, you can go up Avalanche peak
You can go up the Avalanche Peak track and descend by Scott's track. It doesn't take all day to do that.
If you want to make it more interesting (and a full day), you can go up the Bealey Track to Mount Bealey
and then traverse the ridge to the north, first to Lyell Peak and then Avalanche Peak. From there you can descend either the Avalanche Peak track or Scott's. On the traverse, you will occasionally need your hands, but the scrambling is pretty easy.
You'll need good weather for this, but if you have it, the views will be outstanding.