Do pack light
The first tip on what you should and should not do in Greece focuses on packing. You'll be getting on and off planes and ferries. So don't tire yourself dragging a heavy suitcase. Besides prescription meds and other travel basics, a Greek getaway requires the bare minimum - comfortable walking shoes, light summer clothing, one or two bathing suits.
But bring a jacket
Bring a light sweater or jacket should the evenings turn chilly.