He's not sure why Ensign Kim is surprised by this -- isn't a map the obvious way to get around? -- but he lets it pass.
Time to converse. Inquiring further about Ensign Kim's life would be terribly rude without a clear opening, of course. He could ask more questions about the ship or Starfleet. It seems a bit early in the conversation to launch into an anecdote from his own Navy days, not to mention a bit early in the day and light on alcohol. He's still confused about how socializing works here. How about...
"When I was a captain I used to invite my young officers to dinners in my quarters. It was a regular custom among Navy officers of greater status, though of course some were more likely to extend invitations than others. Does Starfleet have any such custom?"