Tongan paʻanga (TOP). Both Westpac and ANZ banks are available and a number of ATM machines are spread across Tonga.
WHEN TO GO
May to October is the best time to visit because the average temperature sits between 25 and 29 degrees Celsius. The wet season falls between November and April. This is also cyclone season, with most cyclones occurring between January and March.
Tongans are predominately Christian and go to church every Sunday, so you might find that almost everything is closed on Sundays.
A direct flight from Auckland Airport will get you to Nukuʻalofa Airport (located on the island of Tongatapu) in approx. 2hr 50m.
The easiest way to get between each island group is by plane. Just don't expect a huge Boeing - the flight from Tongatapu to Eua is just seven minutes long!
VIDEO FROM HOUSE OF TRAVEL