NONE - Milford Sound you sail in from the Tasman and then go to the end - turn around and sail out. You will go all the way in for the tender to take you ashore. You will not miss a thing!

Personally I would not call this one of the most beautiful routes in the world. It is very dramatic when you first leave Milford before you go through the Homer Tunnel. Then the rest is great in places not as great in others. As you near Queenstown it gets really beautiful again. No slouch but I think "most beautiful in the world" is stretching it a bit.

If the ship makes a trip into DOUBTFUL SOUND that you would miss and this is quite different from Milford. A beautiful Fjord but not as dramatic. I think the trip to Queenstown is preferable.