I've only experienced a few rough days at sea fortunately ...BUT I find that if I do something like solitaire or focus on something mundane, it's easier. Laying down or reading seems to make it worse if the ship is rocking ...what do you do on rough sea days?
Walk around the interior of the ship. Maybe find an activity.
We go as far forward as we can to watch and enjoy the movement of the ship, on the Island Princess you can have breakfast and watch the storm.
If it is evening we go to the lowest area where there are windows and watch from the bar (if there is one). At night we sleep while enjoy the rocking and rolling of the ship.
We like the rougher seas. DD and DH aren't bothered by motion sickness, and I take Bonine every night starting the night before we sail. The motion of the ship makes it feel more like a ship instead of a hotel :)
We get ice cream and watch the storm! Weather geeks we are!
Love to wander around the ship and check out all the nice spots. Also find a good window location or 3 to watch the waters and what may be outside.
I like to go for a walk around deck, maybe find a nice place to sit, get a dink and just watch the storm. I d not get motion sick so to me it is fun to watch and feel the ship movement.
Love love love that no one lets it "ruin" their day.
We had such rough seas in Mazatlan that our departure was delayed by a couple of hours. We hardly even noticed it at dinner. That was our only experience and we missed watching the storm.
DH really likes rough seas. He'll find a place to watch the ocean and read his book. If we have planned to attend things happening on board, we do those things (or find them, i.e., wine tasting, art auction, etc.). I often retreat to the casino. If the seas are rough at night we both sleep well. In fact, on one cruise we forgot to lock the balcony door and the ship rocked so much the door opened. It woke us up, but neither of us wanted to get up, so we just went back to sleep.
Ive been in rough and tough seas working back in my younger days with the USCG. That was part of the job. So I believe its the size of the ship and seas. RCL had that major epic fail sailing into a major storm and beat the ship and crew and pax bad. So... With that its kind hard to just read a book. The storms and seas Ive worked in make you just hang on and roll with it and work in it. I feel bad when that happens to fellow cruise enthusiest.