I think I know a way we could close Guantanamo, and still torture those the Bush administration wants to torture.
Just make them fly around the nation on commercial flights in economy class.
They would spend the rest of their lives having to deal with faulty self check-in machines, endless lines, absurd security rules, inexplicable flight delays, bad pay as you go meals, and lost baggage.
This could be as effective as waterboarding.
And as a quick aside:
Is there any rule that mandates that the employees of Delta Air Lines are not allowed to smile? I have never seen as grim a collection of people as those manning the Delta service counters across the nation.