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I am booking an excursion with Captain Marvin in the Grand  Caymens.  I will be on the Galaxy.  My question is regarding getting off the ship early enough to book an early trip.  I know that certain ship excursion get to catch the first tenders into town, but since this is a private tour that I am booking myself, will we be able to get off early if our tour is early?  Thanks for the advise.