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One Day Cruise to 3 islands Hydra-Poros-Aegina One Day Cruise from Athens to the Saronic Gulf islands of Hydra-Poros-Aegina Departures :  Daily at  08.00 a.m.  Duration :  aprox. 11  hours . Hydra  island  ( aprox. 2 hours visit ).  The One Day Cruise to 3 islands Hydra-Poros-Aegina from Athens, is the perfect way for the traveler to … One Day Cruise to 3 islands Hydra-Poros-Aegina