“Cast Away” (2000) with Tom Hanks was filmed on Monuriki, an uninhabited islet in the Mamanucas — Wilson's beach really exists.
The 180° meridian crosses Taveuni island: you can stand with one foot in each calendar day.
You island-hop by catamaran from Port Denarau. An eSIM helps: Yasawa shuttle timetables, cyclone weather from November to April and kava ceremony etiquette.