New Zealand Lens Choice

Personally I hate changes lenses unless I have to.

These are my thoughts

1. You run the risk of dropping the lens.  
2. Run the risk of introducing dust to the sensor then having to clean it and test to be sure it worked.
3. Missing a shot cause one is obsessed with changing lenses.  You cant always say stop and do that again , but I have asked for a redo depending.

I see primes as a specialty lens (s) with a pretty clear idea of what you want as the artist to accomplish.  Just saying I try to research a location or scout it if I can.  The zoom lens or just using a p&s type of bridge type camera makes life so much easier when I am on the move, dont have time to change lenses.

If I have to have a system camera I try not to have more than Two (2) lenses.  Main lens and one for low light no flash perhaps.  OR I will decide I can live with one lens whatever that is.

If I want lots of versatility and want to do video that does not suck it is a p&s type or just taking a small camcorder since they usually always do better than any camera as a self contained unit

If water/beach or pool is involved I have a waterproof camera solution and will leave the other camera or make sure it is sealed from getting sand or spray in or on it.

It is helpful to know where you are going and what kind of working space one has and if you can use flash or not.  That also will change my mind.

In the end if it gets too out of hand I will look at my DSLR again and think why not take that since by the time I get all this stuff in a bag it weights the same but I get a FF sensor then I may go back to my p&s or really scale down what I pack

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No one can truly answer what is right since it is your trip and you have to carry the gear and be comfortable with it,  IMO if it gets too complicated the Sony RX-10 ii or iii has my vote and what I do