You can talk to the bartender, but he/she will only try to sell you materials (or buy them from you). You cannot get a drink. You can sit in a seat at the bar, but then you are too far away to talk to the bartender. None of the other crew will talk to you, or even notice you. You can dance in the hallways and they will completely ignore you. You are the invisible Commander, not to be interacted with.
You can go to the bridge and sit in the command chair, and watch the carrier jump from there. But none of the crew will notice you there either.
You can go into your private ready-room, and look out the window. But none of the crew will join you.
So um, enjoy?