Reconfigure them and put them on permanent standby to provide power for the serial disaster that is Puerto Rico. Or, as prison ships and movable brigs.
(”Opt to spend your time in the brig in the Sunny Caribbean at Guantanamo Cuba! Experience the onboard in the relaxed atmosphere with 3 square meals and hospital care, surrounded by beautiful prison island Cuba, and a view across the strait to dark and exotic Haiti!”)
They’re not even good for that. Even the steel hulled ones are developing hull cracks and other problems.