Cook Islands has two distinct seasons. The cooler season, from April to October, is dry and averages 20-26oC, with cool nights.
Comprehensive travel insurance is recommended. There is one government hospital (on Rarotonga).
The locals are adept at making items of clothing and items like necklaces and jewellery made from shells. Giving somebody a shell necklace and placing it around the recipients neck is a goodwill and love gesture.