In reply to telemarker79:
There is some really good bouldering out at Baring Head and a few sport route there as well. a few other boulders dotted around slightly closer to wellington.
There is a nearby sea cliff crag called Titahi Bay. This gets a lot of stick as being a bit shit but there is definitely some fun to be had climbing there as long as you don't expect any kind of classic crag. Its a nice setting at least.
There is also an indoor wall called Fergs, on the harbour side.
There is a guide book to the local crags and i think a specific bouldering guide to baring head.
whanganui bay is definitely worth the drive up to to taupo.
didin't do any alpine climbing, i think there is some stuff up around the ski fields on the North island in winter, but it's not a patch on the stuff in the south. A friend of mine was accessing it with skis i think (might suit you judging by your user name?).
Have fun