Milford Sound is an unforgettable spot.
The drive into Milford Sound is equally spectacular as the sound itself. With a number of rewarding short walks. So give yourself time.
If you travel in your own car then here's a locals tip....Get yourself in a zen state as this place is intense.
Once the tour buses depart by 4pm, the locals are in their element (including sandflies). Find yourself in a quiet space and do what you need to do to take it all in.