Do you know of a means of travel to the Greek ilslands other than flying or cruising?

I am unable to fly due to health reasons. I would like to visit the Greek Islands. A cruise ship will only take you one way (usually dropping you in Spain)I live in South Florida and can access water vessels easily, Can someone refer me to a transporter who could drop me in Greece or near it and allow me some time to explore before returning to the US?

swimming- you just have to cross the atlantic ocean, and the mediterranean sea

a train or sub ?

ya it miht be by submarine

firstly u have to come in Greece and specifically in Athens.Then there r many ships and vessels that leave u in a different island every time and return at a fixed hour to get u to another island.They r very safe and people r very friendly and willing to help u.U won t spend many hours in the sea.Greek islands r altogether in the heart of Aegean Sea.

nowadays the only vessels from Greece to the states are cargo ships. so either you can refer to a cargo company, which is unlikely to happen since it is illegal to carry passengers or you take any vessel to the continental Europe, there you get connecting trains to Athens-Greece, an d since you are there, there are plenty of vessels to any island