Tours to New Zealand in May are associated with active vacations, because it is a little late for swimming, and mostly early for ski vacations. The North Island is always warmer than the South Island. The thermometer in May can show +10°C even in the Bay of Islands. On the South Island it is +7°C. Sometimes the air warms up to +25 °С, but it is quite rare.
This month you can enjoy fishing, mountain biking, bungee jumping and hunting. And many high-altitude hotels are already letting skiers in, go to Mount Hutt, for example. True, it is better by the end of the month. Vacation in New Zealand in the spring can be successfully held in Auckland, Rotorua, Wellington, other cities of the country. And start from there on excursions to any point.
Prices for vacations in New Zealand in May are slightly more expensive, the winter season is approaching. The lowest price for tours to New Zealand in May will be about 2000 NZD for one without a flight, but with accommodation. A full-fledged tour of New Zealand with a length of 10 days costs 5000-6000 NZD per person, if you take into account excursions and interesting programs, and including flight.
If you are not sure which cities and resorts you can go to for your budget, use the tripmydream service. It will find the most favorable tours to New Zealand in spring.