Giorgos writes in with these tips: See more pictures of Koufonisi
"Koufonissi? Try high season and compare prices to Mykonos... Low season is better, since this 400-inhabitant island goes to up 2000 people in July and August. Best things about it? Very few foreign tourists (got sick of hearing Italian all over Cyclades) and fantastic beaches. Worst thing about it? No ATM or Bank - so you'd better get all your money from Naxos, plus food is expensive. The most beautiful beach on the island is Pori. The island is very small, so you'd better not take a car, there's no use to it. Other than that, the island has lots of fresh fish and lobsters (no, really fresh!!!), so try anything like that (such as the expensive but fantastic astako-makaronada, lobster spaghetti).
"The food is a bit expensive if you're a student, but fine for all the people that go yachting there.... Night life is pretty poor–there's one bar and I heard there's a club as well, but didn't bother to look for it.
"Also, daily there is a kaiki (small fishing boat) from Ano Koufonissi to Kato Koufinissi, which is not inhabited. In Kato Koufonissi there is a taverna with good food. If you want to go to Keros (the third island which is actually bigger than the other two) you have to rent a kaiki ride, about €30 We were on a limited budget so we didn't visit Keros (on which, by the way, there are lots of ancient ruins).
"Speaking of deserted beaches.... I guess that's the
place! Well, that's mostly it! We had a very good time in Koufonissia, but
from what I hear, I would never suggest to someone to go on high season, I
cannot imagine how a place with 400 locals goes to 2,000 in July and August!"