The biggest health problem for visitors to New Zealand is over-exposure to the sun , which shines more fiercely here than in the northern hemisphere, its damaging ultra-violet rays reaching a far greater intensity. You should take extra care, especially at first, to avoid burning. New Zealand has a high rate of skin cancer , so it makes sense to slap on maximum-protection sunblock . Remember to re-apply every few hours as well as after swimming, and you should avoid sunbathing altogether between 11am and 3pm, when the sun is at its strongest. Keep a check on any moles on your body and if you notice any changes, during or after your trip, see a doctor right away.