I'd recommend the overnight cruise in Milford Sound. The scenery is breathtaking, and it's easier to access. If you're into gourmet experiences, a trek with some food stops could be a fun way to enjoy the landscape and taste local cuisine. Once I did wine tour in Barcelona through gowithguide.com/spain Maybe you can look at gowithguide's website for such tours. I can ask in Milford community too www.facebook.com/groups/465276698461313/