Just to chime in again, last year we did the overnight land trip to Queenstown, because both Linda and Ngaire recommended it highly. And, indeed, it was one of the highlights of the cruise. It's a great way to see part of the country and literally (we were told) about a million sheep. The excursion must be arranged with your TA or Regent long before boarding, and it cost about $1000 per person, but we thought it was worth it. Less than 40 participants were on the trip, and there was considerable excess demand. (We were also told you really don't miss anything on that part of the voyage.)
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Eugene