Early Booking Offer Barceló Hydra Beach Resort!! Booking early has its rewards. Make the most of the occasion and benefit from a 10.00 % discount if you book early. Dates Valid: Offer valid from 01/05/2014 to 27/09/2014 Except from 01/07/2014 to 31/08/2014. Valid for bookings made 30 days in advance. Book Now.