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Prices
You pay when you board in Hydra port for a return trip. You will be given a receipt. Due to some Greek laws, it is not possible to buy a single ticket. So if you want to walk to a beach and then a beach boat back you will still have to buy a return ticket at the departure point in Hydra before you set off, even if you don't use half of it.
During the season, the boat owners put sandwich boards or notices on the back of their boats to say where they are going, what time of departure and return.
Times and prices from 2019 (subject to change)