Have done the galley tour once because my wife insisted I go with her--my wife has done it a few times with her sister, sister-in-law, etc. I know a little about cooking so I'm not interested in how they feed several thousand-- Saw basically how they did it in the Army so it doesn't hold much interest for me--it's how good it is that matters re/ food.
My favorite tour aboard ship is the bridge tour. Love to be able to stand there and look out over the bow and see all that wide open space-- have sat in the " Captain Kirk " chair once or twice--that feels good, if only for a moment !!