Ten days for both north and south islands is a bit rush but doable .
You actually could check :
http://kaleidoscope-newzealand.nzwt.co.nz
Trips can be planned , customized and tailor made
Hello, had joined their free and easy road trip for honeymoon . It was awesome . Many tailor made itinerary , private tour , coach trips for north and south islands .
Just visit the website below:
New Zealand Tours and Holidays
http://kaleidoscope-newzealand.nzwt.co.nz