If you're worried about seasickness, pick a cabin that's as close to the water level as possible and in the center of the ship. You'll be at the ship's fulcrum point, which means you'll feel less movement than people on higher decks with cabins far forward or all the way at the back.

To minimize the effects of seasickness, the "sweet spot" on a cruise ship is low and central (mid-ship). The ship acts like a giant seesaw; the bow (front) and stern (back) experience the most dramatic pitching motion, while the higher decks experience more swaying or rolling. By booking a cabin on a lower deck (Decks 2–5) near the center of the ship, you are positioned closest to the vessel's center of gravity, where movement is most dampened. Additionally, having a balcony cabin or a window can help, as being able to see the horizon allows your brain to synchronize your visual input with the motion your inner ear is sensing. If you feel ill, heading to the lower, central public areas or the promenade deck for fresh air is often more effective than staying in a high-up lounge.