Hi All,
Many thanks for the posts and information.
We are expecting that some places will be some-what 'flying' visits - such as Napier. The main purpose of stopping at Napier is to take a break from driving and take a look at some of the architecture before continuing on our route.
@ Geoff - I completely agree with your views on having a scheduled itinery so a lot of what we are going ot do is a touch of route planning but other than the arrival date and date of departure we are pretty much going to take our time (as much as possible) and do what ever there is to be done in that area.
I think that most of our time is going to be spent in the South island and, by the sounds of it, working our way down the west coast. We're both very into our nature (not naturism I hasten to add!

)and wildlife so hence the visits to Stewart Island and Otago Peninsula - I've heard/read that they are meant to be very good for resident wildlife.
To be fair there's so much to do I don't think we'll be able to get it all done in a measley 3 weeks but I don't know when/if we'l get another chance to come back so we want to make the most of our time and see as much as posible but without running around like headless chickens - I'll have to let you know if we manage to do both!
On another note I have heard that my fiancee has been looking at land/property prices in NZ

Have to wait and see about that.
Kind regards,