Los Angeles → Catalina Islands → Ensenada → Los Angeles

> and were there lots of mainland Chinese people on it?

I mean, I didn't exactly go around asking people "are you from China?", but based on the number of people who sounded like they were speaking Mandarin I'd tentatively answer "yes".

> Sadly the symptoms for CoVid-19 are pretty common across a variety of diseases, so “flu-like but not flu” doesn’t necessarily point to this.

Indeed, which is why I'm still at least somewhat skeptical. Still, it's hard to rule it out, especially given the relatively-severe symptoms (not the absolute worst I've felt, but it was pretty bad).

That said, you'd be surprised what draws tourists from mainland China; Las Vegas and Reno (for example) both get plenty of Chinese tourists looking specifically to gamble, and I'd imagine the ship's onboard casino to have a similar appeal. Plus, there were plenty of other tourists from long distances, too, both from within the US (East Coast) and from Europe and Australia (from what I gathered from the people whom I did talk to). So evidently there were at least some non-Chinese tourists flying thousands of miles for it; seems reasonable that some mainland Chinese tourists might, too.