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Oceania's tourism future is shaped by a distinctive convergence of pressures that no other region faces in the same combination. The destinations sit at the front edge of the Western Pacific Warm Pool, so reef collapse arrives earlier than almost anywhere else, undermining the dive, snorkel, and overwater-bungalow products that anchor the high-volcanic islands while simultaneously threatening the very existence of low-lying atolls in the Tuamotus and Northern Cooks. Every destination is structurally captive to long-haul aviation just as decarbonization makes that aviation more expensive, and the May 2024 Air Vanuatu collapse showed how fragile national-carrier sovereignty has become. Microstate demographics compound the problem, with resident populations often dwarfed five-to-one by their own diaspora in Australia and New Zealand, producing visitor-to-resident ratios above 10:1 in places like the Cook Islands and Palau. Customary land tenure across Fiji, Vanuatu, New Caledonia, Guam, the CNMI, and Aotearoa shields the region from speculative development but slows coordinated coastal retreat. The same shoreline that hosts tourism increasingly hosts US military buildup in Guam, the CNMI, and Palau, making the entire region exposed to any Taiwan-Strait kinetic event, while China actively weaponizes tourism demand to pry microstates away from Taiwan recognition. Cruise economics deliver volume but little landed spend onto narrow port catchments now facing IMO carbon pricing. Climate diplomacy and loss-and-damage finance have become a genuine Pacific revenue stream led by Fiji and Vanuatu, but seabed mining in the Cook Islands EEZ threatens to fracture the clean-green brand on which the high-yield low-volume strategy depends. Layered over all of this are biosecurity vulnerabilities born of evolutionary isolation, volcanic and seismic tail risk, and an acute language and cultural-data sovereignty problem in the world's most linguistically dense region, where generative AI threatens to commodify Reo Tahiti, te reo Māori, CHamoru, Bislama, and dozens of Kanak and ni-Vanuatu languages without customary consent. The underlying tension is that Oceania asks microstate populations to safeguard continental-scale ecological estates and absorb great-power strategic competition simultaneously, and whether their cultural, ecological, and political sovereignty survives that asymmetry is the real 2100 question.