Hydra is defined by its harbor. The best first move is simple: arrive, walk the curve of the waterfront, then begin climbing into the side lanes for the quieter architectural views.
You do not need a complicated plan for Hydra. The island works best when you let the harbor rhythm dictate the day, with a swim stop or lunch reserved once you have a feel for the light and the crowd levels.
If your time is limited, prioritize the harbor walk, one inland detour for elevated views and a long coffee stop by the water.
