Hi Ashley,
Welcome to TravelBlog.
Wow, lots of questions :-)
Rental cars - my guess is it would be cheaper to leave the car at the ferry crossing and pick another one up at the other side. Also, excuse me for asking, but are you over 21? You might have problems getting yourself on the contract as a driver if not.
Money - you should still be able to cash travellers cheques, at least in the larger cities. Either way, they were still definitely being sold when I was home last Christmas.
Advance reservations - the new school term starts Mon 27 April, so depending on where you are considering staying it would probably be worth booking ahead for that first part.
Wireless internet - quite a few places have it, but some at least will charge. Worth keeping internet access in mind when looking at accomodation. I can give you internet cafe info for Auckland if you want it.
Cell phone coverage - I haven't heard of the carrier you mentioned. Does it take a sim card? My suggestion would be to get a prepay sim card in NZ. The packs cost $25-30 but include some credit.
Also, I'm a huge fan of skype, and highly recommend buying skypeout credit which will allow you to make cheap calls from any computer with skype downloaded. I call overseas cell phones from my laptop even and don't look at how much it costs cos it's so cheap.
Warm clothes - yes, but bring layers and a good raincoat. It'll be autumn/fall when you're here. Depending on where you go the weather can be quite unpredictable, but just be prepared and you'll still have a great time.
Converter/adapter - either way you'll need them, so it won't really matter where you get them. NZ only takes the 2 or 3 flat pin plugs.
Laundry - most hostels have laundry facilities, I would imagine B&b do too. Should be coin laundries in most cities.
Can't help much with Christchurch sorry :-)
National Parks
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