You'll spend part of a day and all night travelling.
Do I have to book early or I can book when I ll be there like just a day before ?
I would book now since you know your travel dates.
Good job you don't want airplanes, as there are none on this route!
I would book now for the bus / ferry / train tickets as you are travelling at the peak travel time, and plan for a very, very long day!
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