Here are some examples from different language families:
Polynesian:
* Hawaiian: Mahalo
* Samoan: Faafetai
* Tongan: Malo
* Tahitian: Mauruuru
* Māori: Tēnā koe (formal), Mā te Atua (more literal "thanks to God")
Melanesian:
* Fiji: Vinaka
* Tok Pisin (Papua New Guinea): Tenkyu
* Bislama (Vanuatu): Tangkyu
Micronesian:
* Chuukese: Än säk
* Marshallese: Komol muri
Note: These are just a few examples, and there may be regional variations or other ways to express gratitude within each language.
If you have a specific island or language in mind, let me know and I can try to provide a more accurate translation!