Carnival said the maneuver Wednesday afternoon, resulting in the ship listing to the port side, was meant to avoid a large buoy that was adrift and mostly submerged.
Carnival spokeswoman Jennifer De La Cruz said says 60 guests suffered minor injuries. Nobody required an ambulance at the pier or hospitalization.
The Coast Guard has been notified.
Passenger Patrice Edwards told KHOU-TV that she and her husband were in bed when both ended up on the floor as "the whole boat just shifted."