You could reach the island of Thassos by flying to Athens, to Thessaloníki or Kavala , ”Megas Alexandros – Alexander the Great” airport.

Then you pick up a taxi to the port of Keramoti – 5 to 10 minutes distance- and then by a 35 minute ferry boat to Thassos town (Limenas) . Notice also that during the summer season there are direct charter flights to Kavala Airport from many European cities.

Driving distance from Athens to Keramoti is 700km, from Thessaloníki to Keramoti is 220km and from Alexandroupoli to Keramoti is 151km.
During summer there are scheduled ferries every half an hour (until 9pm or 10pm depending) . You do not have to prearrange tickets, because you can buy them at the port.
When you reach the port of Thassos town (Limenas) you can pick up a taxi or a bus to Golden Beach, where the Hotel Fedra is established.