The Hihifo Freshwater Spring on Niuatoputapu in The Niuas island group is a hidden oasis. Though one of the more challenging destinations to reach in Tonga, this crystal-clear spring emerges through a crack in the land and offers a serene swimming experience. Located in Hihifo, the main village of Niuatoputapu, the spring has steps for easy access. When visiting, it's advised to swim in shorts and a T-shirt to respect local customs, as it's a popular spot among locals too.