Hi johnathon, I am glad to see someone interested so fast. I was not expecting such a fast reply for this. I personally am unsure of the biking thing, i grew up biking so I know how, but I never have done long distance on one. it might possibly be something to think about if no one else is interested though.
I would definitely be up for Milford, but what about kahurangi? The pictures I have seen of it are breath taking. I don't know much though about NZ, I have never been there before. If you think that Milford would be better, then I'd be all for it. At this point it's all suggestions...