This is what happens when you are new to cruising!
So I finally got around to checking-in online today. Turns out that a 3pm Port Arrival timeslot was the only option available, even though we are arriving at 11am!
I called Disney and they said we can just show up and let them know we are there earlier than our selected time. Does anyone know what our chances are of being allowed to board earlier than our designated 3pm arrival time? It wouldn't be much fun to sit in the terminal for four hours staring at the Dream!