On a bright September morning, San Juan’s waterfront erupted in confusion: a man leapt from a docked cruise ship, was hauled from the sea by jet skiers, and landed in federal custody. Debt, Cash, and a Rule Many Travelers ForgetWhen authorities searched Gonzalez-Diaz’s backpack, the contents raised even more questions. Gonzalez-Diaz allegedly owed more than $16,700 to Royal Caribbean, much of it tied to casino gambling on the weeklong voyage. Authorities have not explained the mismatched identification documents or whether ship security had any warning before Gonzalez-Diaz jumped. For San Juan, where cruise ship arrivals are usually measured in music, buskers, and tourist bustle, it was a sharp interruption of rhythm.