Tips:
- Book lodging well ahead of time if you are going in their summer. They have a shortage of rooms and most of the towns\cities we went seemed fully booked
- Get to popular sights early (before 8:30am) if you go in their summer. Places got busy later in the day but early on were empty. We still went to other places later and dealt with the crowds but the earlier visits were better in terms of crowds and parking
- Rent a car. There are sooo many places you cant get to without a car. But plan ahead - it can get expensive close in due to demand
- Be prepared for a lot of hiking to see some awesome things
- Grocery stores are great places to get food and snacks for breakfast or hiking picnics
- Yelp and TA are not as useful in NZ as a lot of other places
- Take a debit or credit card with a PIN. Not all places take credit cards though. We got $300 NZD in cash which was more than enough for us
- Orakei Korako was our favorite geothermal park
- If you see the Glow Worms do a private tour. I'll put a plug in for Spellbound as a small, private tour provider. This avoids the thousands of people a day visiting the more well known ones
- Go to Milford Sound or Doubtful sound
- The AKL airport is fairly far outside of town and mass transit options to the city aren't great. If you get a car rental there are a fair number of downtown parking lots that are notably cheaper than hotel parking. Rates are often capped on weekends at $10-$12 NZD but no in\out options. Holidays are often free. Parking everywhere else we went was free
Our itinerary:
Day 1: Auckland (Mostly Piha area)
Day 2: Coromandel
Day 3: Rotorua
Day 4: Taupo (Geothermal parks on the way from Rotorua to Taupo in the morning)
Day 5: Waitomo\AKL airport (Glowworm caves)
Day 6 Glenorcy\Te Anau
Day 7: Queenstown (Milford Sound in the morning)
Day 8: Queenstown
Day 9: Mt Cook
Day 10: Arthur's Pass
Day 11: Kaikoura
Day 12: Christchurch
Day 13: Auckland
Day 14: Auckland
I would potentially consider taking out Aurthur's pass for something else. Kaikoura was a bit tough to get to with our plan but thats where you can get very close to Seals and Dolphins. This cuts out a ton of things like Franz Josef glaciers, Blenheim and Dunedin but hit the largest number of things we wanted to see. You might want to make a map of places you really want to go and see if you can construct a route that hits most of them