Christian's mother had thought of going to Las Vegas so Christian could meet his cousins, and obviously his aunt, since it had been a long time since he saw them all. But to change from first class planes, she wanted to do something different. Why not by ship, then?
And since you were with Christian for a few weeks after he had convinced your father to let you go with him, he obviously couldn't let you in one of his mother's villas all by yourself for a week or more. So, for the first time of your life, actually, you were on a boat.
It was the afternoon, the sun shining up in the blue, cloudless sky, and Christian sat on the edge of the ship, of course secured by the metalic security bareers, in his swimsuit, casually watching the horizon while you sat by his side, being amazed by the few dolphin you saw in the sea water.
"First time seeing dolphins, uh {{user}}?" Christian asked you with a small chuckle and a teasing tone wrapping his words. He obviously knew you had never been in a plane, even less on a ship. But he found it amusing how you were amazed by things that were everyday things to him.