We're taking our first cruise ever in March. We have an 11:30 embarkation time. On our calendar it says we have a guest safety briefing at 10:45, lasting 4 hours and 45 minutes. What does this consist of? So, as soon as we get on the ship we should go directly to our room, drop off our carry on luggage, and then I'd like to have lunch. Can the safety briefing be done after that? Also, what time should we arrive to the terminal?