The answer has not changed since you asked this before .
No , there is almost zero risk regarding islamic jihadist terrorism threats to anyone travelling in the Greek archipelago by ferry . Having said that , someone has to win the lottery and it might just be you , so if you are REALLY anxious about this then best stay at home with a galvanised metal bucket over your head .
The Aegean is patrolled by the Greek , Turkish and U S Navies , and there is also a strong N A T O naval presence . And continous 24 / 7 air cover . And special forces from several nations in the area on immediate standby .
If you are interested in Greek Islands travelling, you can surely do that. And you can be assured that in spite of the recent attacks in Tunisia, it will be safe to travel around the Greek islands. And yes ferries are completely safe to travel by.
Greece is a beautiful country.. With it part of Europe you have nothing to worry about, you will be safe travelling on ferries and going on boat trips ect.
Paxos anti paxos and Corfu are wonderful!
Have fun:)
You stand a better chance to be seasick if the weather is a bit windy in the Aegean, than having any problem of any such kind as you imply with your question. No worries. Simply sail away to your desire.
Greece is not in Tunisia
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