Budget for 7 days in North Island of New Zealand with campervan

We are two adults and three teenagers age 15, 13 and 12. Traveled for 7 days in a Jucy condo campervan. Here is our budget spending for the trip.

• Jetstar Ticket                   AUD 954.95 (bought in December 2015)
• Visa New Zealand           AUD 195      ( in December 2015)
• Jucy condo                      NZD  607.42
• Food & groceries            NZD  370.5
• Accommodation              NZD 103
• Petrol                               NZD 270.17
• Attraction (museum etc) NZD 522.5    (most spend for Hobbiton)
• Laundry                           NZD     9

We spent AUD 1149.95 and NZD 1882.59.
All together NZD 3055.54 or NZD 611.12 per person.
(Currency rate: 1 AUD = 1.02 NZD)

PS:
I forgot to put these:

• Parking near Skytower  NZD  3
• Souvenir                        NZD 15
• Travel Insurance            AUD 95.7 (from 1cover)

Well, the Jucy Condo itself already included full insurance, but those who live in Australia would know that health expenses are quite high in this country. Therefore, I think I need to cover my family with travel insurance, in case something happened. I think the cost was quite affordable for 5 people in a week.