I get seasick, so I don't care until the meclizine kicks in. After a few hours when I can open my eyes without nausea I am sure I would prefer a huge cruiser. A small boat on the high seas doesn't sound safe. Plus where are you going to store all of the luggage?
I've never had a large cock IRL, and my longest term lovers were 5.5" to 6" and I've been plenty happy. I prefer a cock that I can get all the way in my mouth.
Cocks over 7" scare me, but it's probably just a matter of what you're used to. Different strokes for different folks, as they say.