Tonga Travel OverviewThe archipelago of 'The Friendly Islands' was united into a Polynesian kingdom in 1845. 30 years later it became a constitutional monarchy and a British protectorate in 1900. Tonga acquired its independence in 1970 and became a member of the Commonwealth of Nations. It remains the only monarchy in the Pacific. Located in the South Pacific Ocean; you will find the islands of Tonga about two-thirds of the way from Hawaii to New Zealand. Tonga's climate is tropical; modified by trade winds. The summer season reaches out from december to may; the cool season from may to december. Most of the small islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base. two thirds of the population of Tonga live on the island of Tongatapu . This is where the airport is; so you are sure to begin your trip here (unless you come by boat). Popular Destinations | 