For the short holiday of 1 week, recommended just tour the South Island for 1 week, recomended 3 night on  QT, 1 day Milford Sound, 1 night on Lake Takipo, In QT, u can stay at the Youth Hotel@ Lakefront,  u can book two x3 bedroom for family member,  the room is clean, quite big, arround 20x20' , all single bed without double desker, and near the kitchen. Rent a Estima shall be goog enough to bring  yrs family member to move around.

In CNY,  not much festival atmosphera in NZ, but u have  yrs family of six for gathering and cooking, can bring yrs own card or mahjong if too boring. Well, it should be fun and memorable even after many year.  They are not much nightlife in South Island, NZ, unless u like gambling, then QT have some sub-par casino, but dun expect Genting standard loh.