My agent got input from Seabourn documents and seems specific to the 30 day, April 14,2024 Cruise (see cruise number below). Still lots of disclaimer and everyone should check for themselves. This was the response:
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The following information is provided as a courtesy and specific to a national of the USA for voyage P431A.
French Polynesia - No Visa Required.
Cook Islands - No, Visa Required.
Niue - No, Visa Required.
Samoa - No, Visa Required
Tonga - No, Visa Required
Fiji - No, Visa Required
Vanuatu - No, Visa Required
Solomon Islands - No, Visa Required
Papua New Guinea - Yes, Visa Required. - Issued on Arrival - Logistics handled on board, guests will be informed of full process once on board.
Guam - No, Visa Required.
Each country has its own entry requirements, and guests are personally responsible to have the necessary documents when boarding. Seabourn highly recommends that all guests carry a passport that is valid for at least six months beyond the completion date of your travel, proof of required immunizations & visa(s) and proof of eligibility to enter all countries on the itinerary.
Some countries require a visa to enter, and it is your sole responsibility to obtain and carry the proper travel documents and pay all associated costs related to these documents. Failure to present required travel documents and visas at cruise check-in may result in denial of boarding with no refund.