I've seen people waiting in line to get on the ship as we're getting off the ship at 9:00am!
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I usually arrive at the port at between 10, and 10:30 A.M., and the porters are always at curbside, taking luggage for the afternoon sailing. The ship rarely starts boarding passengers before about 11, so there's not any real advantage to getting there much before that. You'll just get to sit in the waiting area for an extended time.