Plenty of things can go wrong on a cruise vacation. You could get seasick, or sleep through breakfast, or lose at blackjack, or puke over the rail, or god forbid be on a cruise ship that's lost power and drifting out to sea.
Their seemingly-cultural onshore excursions are a product of the more than half a billion dollars their cruise line pays on advertising each year. With shopping bags in hand, the suntanned Caribbean vacationers return to the ship that their wallets never parted from.
Titanic had a thorough mix of humanity, traveling together toward whatever fate awaited. That fate, everyone figured, was a docking in New York. But an iceberg intervened and here is where the question "Why do we still care about Titanic?" gets more interesting.