No, you are never required to disembark the ship at every port of call; you are free to treat the vessel as your private floating resort for the entire duration of the trip. Many seasoned cruisers in 2026 intentionally choose "stay-aboard days" to enjoy the ship's amenities—like the pools, spa, and buffet—without the usual crowds that accompany thousands of passengers heading into port. The only notable exception is in certain regions like Japan, where local immigration laws may require all passengers to physically clear customs at the first point of entry, even if they plan to return to the ship immediately. Aside from these rare legal mandates, staying on board can be a relaxing and cost-effective way to spend a day, as you have already paid for the food and entertainment on the ship, whereas shore excursions and dining in port can add significant expense to your vacation budget.