I assume you meant the West Coast and methven to Greymouth???
If so then...
Porters is sick. This is my regular weekend stop. Lots of steeps, good snow cover. Also has a sick park from the end of July to the end of September. Gets consistent snow cover every year with regular dumps.
Porters Park
Trail Map
Cheeseman is mellow and relatively flat-ish, Redeeming feature is that there are never any people there and the epic slackcountry area called Tarn Basin or just the back bowl. The lines that you can ski, an hours walk from the top T-bar are nearly as good as alaska. Steep and never ever skied. Well only when I'm not there. Usually a few rails set up. Nothing special though.
Trail Map
Broken River & Craigieburn.
You can't get more club field than these two. Broken River is my personal preference, mainly because you can ski right down to your car and the inclinator thing. Craigieburn is fricking ill to though. Takes 20 minutes to get from one to the other, they honour each others lift passes for a few runs which is dope. I recommend staying at either The Burn in Castle Hill Villiage
http://www.theburn.co.nz/ or in one of the lodges on the field. Don't stay at craigieburn though, stay at B.R.- the lodges are wayy nicer.
Broken River Inclinator
Average mid-week crowd...
Pow dump
Trail Map
(click for full size)
Temple Basin
Travis Rice said that if there was one place that he could ride for the rest of his life it would be here. It's that good. Its an hours walk from the main road, your gear gets taken up by a gondola thingy.
This place is wicked. The manager is an ex-pro skier but still rips.
Also the Atomic team comes here for product testing on their big mountain skis. (Sage, Dana Chris etc.)
Trail map (click to jizz...)
I have not included Mount Olympus because I haven't been there. It is sick from what I've heard though. Gnarly road. High clearance 4WDs only. Black Diamond Tours operate daily trips from methven to here and B.R and Craigieburn.