The 10 day trip went great and car behaved beautifully and nothing at all to worry about in the end, all the EV charging stations were working and mostly not occupied and we never went below 42% charge for any part of the trip (mainly because we were being cautious)
We stayed at a hotels with destination chargers in Christchurch, Wanaka and Queenstown all without a hitch (and no other EVs), and a nice hotel, the Mantra in Lake Tekapo which had lovely town houses amazingly good value with internal access garages with a 10A sockets you could plug your charger into.
I did try the supercharger in Omarama its on an unsealed gravel parking area, the hot tubs and cafe they were adjacent to were nice (you should book ahead if you want the hot tubs) but I would have thought Tesla could do a bit better with the presentation, they had two types of plug and of course I picked the wrong one first (glad nobody was looking). All OK, a bit of a mehhh experience though, the chargenet location was better if you are not in a rush as it has sealed parking, is cheaper and more cafes to choose from.
I was also told (from the "internet") that there were parking spots with power points at the Hermitage Hotel in Mount Cook and I even enquired for them before my booking and they said yes, but when I got there, the receptionists scratched their heads and I found out it was basically the area they store pallets and stores and it was occupied with a quad bike and a pile of something.. Also had a big "no parking" sign in front, so nahh. Minus 2 degrees at night up there so you wouldnt want to spend too many nights there without a charger as it did loose about 25KM overnight. Spectacular views and drive made it worth the diversion.
Hanmer springs was used as a stop over on the way back, but you need to bring your own CCS adaptor cable to use the free chargers by the pool and they only gave 7KW not 22KW as "the Internet" said, but hey they were right by the pools and 4 hours free parking/electricity so sweet. We go there several times a year so worth the investment for us if I can take the model3 rather than the UTE. Also had a tesla commando 16A adaptor on hand as a few stops on plugshare had power points but we never took it out of its packing.
Cruise control was a bit hit and miss. I learnt to turn it off or cover the gas pedal on roads bending to the left on hills or passing cars as it went bat-*sugar*-crazy a few times with braking and collision alerts, cruise worked completely fine on our run home from Kaikoura to Blenhiem at night though, I think because we only passed 6 cars! (Only in NZ). Navigation was better but I had to ignore several attempts to take me off the state highway only to join it again a few kilometers down the road. If you want a laugh try using voice to "navigate to Wanaka" or "Navigate to Hanmer Springs" Also maps could really also do with showing the local EV chargers on it rather than having to use your phone. (I bet theres a setting!)
Range Estimate was a little bit optimistic but not overly so, and I eventually felt confident using it. Coming from a nissan leaf here!
Anyway, total charging costs Blenheim to Milford Sounds return $77 and could easily have done it for half that if we were not so cautious.. Next time we will add an extra couple of days and go back the west coast route, that should be fun.