Snorkeling is not so regulated, but obviously doesn't offer the same intensity of experience that scuba diving can.
The best bet for dive frogs is to connect with one of the companies offering yacht-based diving tours. One of these, Diving Holidays in Greece, offers a number of different itineraries to interesting underwater areas. Excluding airfare to Greece, the cost is about $175 per person a day for a week-long diving odyssey. Groups of 25 or more can select their own itinerary.
A less expensive alternative is to be hotel-based and connect up with a diving club. Need additional certification? Most hotel-based companies will have courses for PADI levels.
If diving through the sister ship of the "Titanic", the "Britannic", appeals to you, ANDI Greece is offering a dive trip to the wreck. The website is scanty on details; contact them directly.
Useful Links:
Diving Holidays in Greece
Underwater ruins and scuba lessons turn the entire Aegean into your playground -find out all you need for a wet and wonderful vacation.
PADI
"The Way the World Learns to Dive". International certification organization, also offering trips to various dive sites.
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