We did a B2B on the Dream a few years ago and are booked to do another. We also stayed in the same stateroom for both legs.
When booking the cruise the
DCL rep did something in their computer system that linked them so it showed we were on consecutive cruises -- this is something they have to do, you can't do it yourself.
When doing online checkin we noted our destination after the first cruise as a
disney cruise, and IIRC the origination before the first cruise as a disney cruise.
The last night of the first cruise we received a letter in our stateroom with instructions for the next day It gave us the time we had to be off the ship, and how the unboarding/reboarding would work. For our B2B we were to go off on our own, there was no meeting of the B2Bers on board, but I have read that sometimes theere is. Follow the instructions in the letter.
Since we were in the same stateroom for both legs we did not need to pack our bags. We took a day bag with us to the port that had some bottled water, something to read, etc, as well as our documents and IDs including passports.
When we got off the ship we had to go through US Customs. We told them we were getting right back on the ship. There was little line by that point so getting through was pretty quick.
As you head out of the Customs hall there is a CM near the exit who is directing people where to go (eg to the buses) and you tell them you are doing a Back to Back. They will point you where to go -- you go back up the escalator into the terminal. We did NOT have to go through security again, but it is possible that would change.
Once in the terminal the checkin counters will probably not be ready yet. A CM explained they have to wait until everyone is off, then there is a bit of wait while the computes close out that ship and load up the next. We were invited to explore the (nearly empty - great for taking pictures !) termina, take a seat and relax.
Once the computers are up for the next cruise they let you know you can check in. We checked in and then were told t o wait in the concierge lounge in the terminal.
Our wait was a little longer than normal because they were doing some filming on board. But once the ship was ready for us the B2B group was escorted back onto the ship.
You CAN go back to your stateroom but they ask you do not go back and forth from it until 130 when everone else is allowed to their staterooms - so you need to decide what you want to do. You will have a brief window before the other guests are allowed on board, but after that you basically need to be at your stateroom or elsewhere.
We quite enjoyed our B2B. Our serving team knew we were B2B and were quite excited at that. The last night the head server asked if we wanted the same table and same serving team and their rotation and we said yes, but we could have changed if we wanted. our rotation for the second cruise was different than for the first.
SW