Well
I really cannot know how difficult is for you there to arrive to your cruise embarkation port since everytime I take a cruise I don't have to travel long distance to get there but here is a lesson to be learn...
I live on mayaguez almost two hours from San Juan port and a lot can happen on a road trip in order to just get to the ship
*Car accident
*Car problems
*Car does not start ect.
Mostly I arrive to port at 11 am and my booking papaers says to arrive at 2:30 pm this is not only the best time to avoid long lines is also a good option just in case...In my next cruise I am even considering to stay the day before in San Juan just to enjoy the old San Juan a little bit...
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