There is a lot that happens on this VIP trip. We toured a sub and a frigate and talked to sailors on both. We got to talk to part of the crew of a nuclear sub including the commanding officer. We also did mock interviews with the recruiting officers. It is not the main interview. You are not under any obligation to join the NUPOC program if you go on the VIP trip. It basically is just a fun time where you get a lot of information about what you would be joining.
I would try to think of questions that you might want to ask before you go but other then that relax and do not worry about it. Where are you going to go to? I went to King's Bay so your tour may be different.