The city of Póros, with its traditional blue and white islandic colours, is very pretty and deserves a walk around. In one of your walks, make sure you end up in the old Clock, on top of the hill around which the town is built. The view is magnificent, especially close to sunset, when the last light of the day shades the slopes of Adéres mountains, Galatás, the Lemon Grove etc.
In the first 10 days of July, every two years, Póros hosts the Naval Week, the most glorious celebration of the island.