Ok so I have posted a couple itineraries on here and finally think that I may have the one! I took everyone's suggestions into account so here is what I came up with. A little background again: My sister (25) and I (22) will be visiting NZ this coming August. We haven't booked any flights or anything yet. We are from Michigan, USA so we are used to our winters. Snow doesn't bother us. That being said, we want to keep this as safe as possible, obviously, so if there are any routes that are not feasible to drive in August please let me know. Anyways, my tentative itinerary is as follows.
Day 1: Fly into Auckland
Day 2: Explore Auckland, visit with family
Day 3: Drive to Rotorua and see the Waitomo Caves along the way
Day 4: Hobbiton Tour/Explore Rotorua
Day 5: Early flight to Christchurch, explore Chch
Day 6: Day trip to Akaroa, explore Chch
Day 7: Tranzalpine train to Greymouth, explore Greymouth (maybe drive to Punakaiki)
Day 8: Leave for Wanaka, arrive late
Day 9: Explore Wanaka, leave for Queenstown
Day 10: Explore Queenstown
Day 11: Day trip to Milford Sound (cruise)
Day 12: Leave fore Mt. Cook, explore Mt. Cook
Day 13: Explore Mt. Cook
Day 14: Leave for Christchurch
Day 15: Fly home
I have the ability to add one maybe two extra nights. Is there anywhere in particular where I am not leaving enough time? Are these driving days too aggressive? I really tried to make it so we stayed 2 nights in each town, minus Greymouth and Wanaka. Should I add an extra night in those? Or in between Greymouth and Wanaka? I know that is quite the distance. I am skipping the glaciers because I have already hiked glaciers in Alaska and don't think we have time to do it here. Also, I left out Te Anau because we will just be doing the day cruise from Queenstown. No point in driving down there.
Anyways, your suggestions are always a huge help!