I just came back from the season in the Aegean. Everything I've heard from my colleugues and friends is that Lefkas has barely any
wind until about 11:00, at which point it gets useable, and by 15:00 it's perfect if not too strong, then returning to barely anything by 19:00.
The saronic is not like that at all, instead, probably because of the influence of the meltemi, the
wind is constantly changing strength and direction. As a result, there aren't as many accessible islands and bays as the Ionian, and you need to keep your wits about you with regard to the
weather. The bouka doura is the afternoon south easterly which mainly affects the argolic, rather than the saronic, it gets to about bf5-6 max, and if you leave Nafplion at the wrong time it can really screw your day up because of the fetch.
All that said, I sailed pretty much every day in the Aegean, and I have friends who sailed 3 times in the whole season in Lefkas. I would say if you're looking for sailing, go to the saronic, if you're looking for bays and culture, go to Lefkas.
However, if you're used to the
BVI, look at the
Cyclades. Beaches there are better than the saronic, the sailing is better and the area is nicer in my opinion. Also, you have the option to simply free swing, which is even easier than buoys!
If I was going to go for a week, depending on the
weather, I would go;
Athens-Vouliagmeni on saturday night. There's a great
fish restaurant on the east shore of the south bay, and the anchorage is normally sheltered.
From vouliagmeni to Kythnos (Kolona beach, shaped like an hourglass!) on monday, stopping for lunch at cape sounion (which has an ancient temple on the cliffs.)
Tuesday Kolona to Serifos (Livadhi) which is the port, the chora/capital of the island is on a mountain directly above the port, and the view from the church at the top is absolutely incredible. Again, you can free swing if you want, or get on the outer quay. Inside is a bit too small for a cat bigger than 40 foot.
From serifos on wednesday I'd leave early and go to Hydra, which is the jewel of the saronic, no cars, touristy, very beautiful. Go to Mandraki bay and get a
water taxi if you're going any later than the first week of June, as the town quay gets truly insane.
Thursday I'd go late from Hydra to probably Palaia Epidhavros, stop for lunch at the beach on the n.e shore of akgistri or maybe Russian's bay just w of Poros town. Epidhavros has this amazing ancient theatre which you need to get taxis to (the best time is about 08:00), but the village where the quay/anchorage is has nothing outside a few tavernas and shops, so you can chill in Hydra or whatever you want to do in the morning.
Friday back to Athens, stop between the little islands on the s.w point of salamis, just e of Kolones, it's very beautiful and relaxing before you have to return to the monstrosity that is Athens.
Don't expect anything from snorkelling. The
BVI makes the
med look dead, it's not worth getting your hopes up over. Also, Athens is vile, figure on spending as much time as you need for the parthenon and ares, but no more.
Hope that helps, I made an account to dispel the myths!