The highest peak in Hydra has a monastery named after the Prophet Elijah (Προφήτης Ηλίας).
The walk takes about 1 hour 30 minutes and is not really tiring (though even at Easter time this is enough for a good sunburn).
The view along the way is back over the main town and port of Hydra.
At the top, along with the monastery proper, there is a wonderful viewing area with a solitary chair.
One imagines the monks watching the sunset and seeking solace in the beauty of all things.