An LPR is required to present an I-551 (Green Card) for reentry into the U.S. If you are not a U.S. citizen or a U.S. LPR, you will need a passport and/or the appropriate documentation based on the status you are seeking in the U.S. for any type of cruise, closed loop or not.
The Picard Maneuver is a battle tactic invented by Starfleet Captain Jean-Luc Picard. In 2355, Picard was in command of the USS Stargazer when it was attacked by an unknown alien vessel, later determined to be of Ferengi origin.
Picolax is a preparation used to clear the bowel before some investigations and/or surgery. It comes as a powder that when mixed with water makes a solution, which you are then able to drink as instructed. It works by increasing the activity of the bowel and also by holding water in the bowel, which helps to wash it out. You should expect frequent bowel actions and eventually diarrhoea.