I seem to manage to get across the ditch to the South Island every 2 years. The most recent trip (Feb 2013) involved two tramps.
First was a 9-day 100km sapping climbs over high alpine passes, scrambles down precipitous scree slopes and strolls along glaciated river valleys. With a 2 day break to re-supply, we headed off for an 8-day tramp through stunning alpine country, mostly off-track.
Rather than repeat the trip reports, here are a couple of links :
St Arnaud - Lewis Pass http://www.tramper.co.nz/?8459
5 Passes (including Lake Nerine) http://www.tramper.co.nz/?8505
Yeah, I know - a bity cheeky posting links to another website - but I was after the first post in the new forum