Thanks people, looks like some MTBing Wednesday week if the weather isn't too bad. I know winters there start a bit earlier than in Melbourne... nice part of the world, though.
It's a shame I wasn't able to organise a bit of a holiday at the end of my trip - did this in 2004 and it was great.
While I'm there I might buy up some of that Central Otago pinot noir while the prices are just stratospheric, rather than astronomical!