In reply to jonny2vests: Hey mate, good luck for your time in NZ. I'm a lifelong resident of Nelson and have been lucky enough to climb at Castle Hill, Christchurch's Port Hills as well as the sea cliffs on the West Coast and my local favourite; Paynes Ford. Unfortunately I can't give you much of a heads up on Queenstown or Wanaka, but I hear really good things about Wanaka at least. Although i'm a bit biased, I really do think Paynes Ford is a top contestant for South Islands best crag. It's never let me down. Plenty of climbs, (300+) i've been visiting Paynes for years and still have more than half still left to climb. There is a wide range of grades to climb from, the predominant average is about grade 22 (Aus), ranging from grades 13 to 30. 30. The rock is all limestone, and Pohara- (which is 30 mins drive from Takaka (the location of Paynes Ford))- also has some great limestone routes. It's less developed, and in places quite chossy, but the style of climbing is a refreshing change, more overhangs and a different feel. If you were looking for a good guidebook, I would highly recommend 'Golden Bay Climbs' (Best for Paynes Ford) or if you were looking for a general south island book (including Castle Hill which is handy) 'Southern Rock' is good too. You can buy GBC from Nelson at Altitude, or from Hangdog climbers camp next to Paynes Ford Reserve. South Island Rock you should be able to find anywhere in NZ. Be warned, I get alot of mixed reviews from tourists about Castle Hill. Those who appreciate the challenge of slopers and technical feet placements, smearing and some rather desperate body positions will love it, but if you're used to an infinity of crimpers and slots, you might be in for a shock. There are definitely some hard routes, but it's a different style of climbing you learn to appreciate, and there are so many boulders, you can end up spending an entire day just projecting one boulder and forget to check out the whole area. It's happened many times..
The port hills are interesting too, there are some hard routes up there and some good multi pitch, lead and mixed climbing to go with it. Best of all, it's directly overlooking christchurch city, if you were keen enough, you could bike up there from town. Absolutely worth a visit. The West Coast is best described as.. well.. weather dependant I guess, it's all trad I believe, but if you miraculously get a sunny day and have plenty of mosquito repellant like I did,, the climbing is both adrenalzing and photogenic. It's a place that can be surreal on a sunny day yet nightmarish on the contrary. so if you happened to be passing by (visiting Fox & Frans Josef Glacier for example) and the weather was good, check it out. Sorry I haven't been climbing in the North so can't help there, but if in doubt, most cities have an indoor gym to go crazy on, and you'll meet other internationals and locals who are looking to car pool for trips to the local crags, so meeting people is easy. Plenty of other stuff going on around in the South Island, river rafting, Able Tasman sea kayaking, mountainbiking, caving, mountaineering, motorcross, bungie jumping, skydiving and paragliding. If there's something you want to know, just ask. I've completed a diploma in Adventure Tourism so if there's something interesting in my reigion, I know about it! Hope my ramble helps if not interests someone. See you guys out there! :P