Requesting feedback on 16-day New Zealand itinerary!

Hi there! I'm traveling to New Zealand next month with a friend and we've just finished sorting out our 16-day itinerary. Would love some feedback on it, especially on the days where we're not sure what to do and if there's anything important we're missing! Planning on driving around most of the time. See below:

**Day 1** - Land in Auckland in the morning, rest from jetlag, check out the city in the evening. Staying at Nomads Hostel Auckland

**Day 2** - Rent a car, go to Piha for a day trip, back to Auckland. Suggestions on what to do in Piha? Thinking of making this a beach day, but down for any hikes or cool nature too...

**Day 3** - Bay of Islands? Not too sure what to do on this 3rd free day in Auckland. Def want to spend it outside of the city as I've heard that it's not that interesting. Any suggestions?

**Day 4** - Auckland Skywalk in the morning, leave for Topdeck group trip (pre-planned itinerary, will outline the rough details) - make it to Rotorua

**Day 5** - Topdeck - Rotorua

**Day 6** - Topdeck - Tongariro National Park, Huka Falls/Lake Taupo

**Day 7** - Topdeck - Tongariro National Park

**Day 8** - Topdeck - Ends in Wellington, stay in Wellington for the evening

**Day 9** - Fly from Wellington to Christchurch in the morning, rent a car and drive through Arthur's Pass + Castle Hill and stop at Hokitika for the night. Anything else cool along this route we should see? Staying at Mountain Jade Backpackers

**Day 10** - Drive to Fox Glacier in the morning and do a Helicopter Hike in the afternoon. Maybe check out Mt Cook if time permits. Drive to Wanaka afterwards and spend the night in Wanaka, staying at YHA Wanaka Purple Cow

**Day 11** - Deep Canyoning in Wanaka. Drive to Queenstown and spend the night there, YHA Queenstown

**Day 12** - Drive to Te Anau. Check out Fiordland National Park (maybe do a Great Walk) and stay overnight in Te Anau, YHA Te Anau

**Day 13** - Drive to Milford Sound, do a day cruise, then back to Te Anau for the evening.

**Day 14** - Drive to Queenstown, skydive, check out Queenstown. Staying at Base Queenstown

**Day 15** - Contemplating a day trip to hike at Lake Tekapo (I know this would be a ton of driving, not 100% sure yet - is there some other cool hiking that's a closer drive from Queenstown?). Last night in Queenstown.

**Day 16** - Fly back to Auckland and stay the evening (Base Auckland), fly home the next day

If anyone has specific suggestions for things to see along our schedule, please chime in. We also don't have any sort of food/drink plans so would love suggestions on bars/restaurants! And finally, I listed the hostels we're staying at - if any of them are actually awful that'd be great to know too haha. Thanks so much!