Hydra by night. A perfect long weekend getaway. In mid-September, the heat backs off and the water is still warm. A long trek or two gives good coverage of the island. Food is excellent, especially if fish and seafood are your thing and you don't mind feta, local cheeses, and Greek wine. Throw in an afternoon boat ride along the southwestern shore, a few dips in the Gulf of Hydra, some late afternoon strolls and a lie-in or two and you'll have the makings for a perfect shoulder/mid-season break.