Kia Ora Eilis,
Thank you for your email.
I suggest getting a Funky Chicken pass for you (it is on special at the moment for NZD 569 until the 15th of June), which is North+South and FREE Bay of Islands.
Your friend could get a Southern Round Up (also on special for NZD 449) and she could join you from Wellington and you would do the South Island together.
Please note, that your friend would need to contact us in advance to pay for a ferry ticket (NZD 55 one way) as she will be starting from Wellington (you would pay for ferry ticket to your bus driver when traveling from River Valley to Wellington).
You could let us know your dates and we would make sure you will be traveling on the same buses together, even though on different passes.
Please let us know if we can help with anything else.
Thanks a lot
If she was to join you for the North Island, the best pass for her would be Northern Round Up (Auckland - Wellington - Auckland) which is NZD 559:
or we have Geyserlake & Land on special at the moment for NZD 369 (Auckland -Taupo - Auckland:
Please let me know if I can help with anything else.