Hydra
The island of Hydra is found in the Saronic Gulf (south of Athens) and is one of the most well-off islands in Greece because it is near Athens. Many families choose to go just for the weekend. The island is very steep, and the only form of transport is mules that are found in the port. The island has retained its charm because neither cars nor motorcycles are allowed here. The silence is broken only by the mules' steps on the cobbled streets and the occasional church bells ringing. Architecturally, you will not find white and blue houses like in the rest of the Cyclades, but likely Hydra's characteristic mansions.
Telendos
Telendos is a small island near Kalymnos. There are no roads, so no matter where you stay on the island, you will not be woken up by the sound of traffic. There is a ferry that drops you on Telendos from the port of Mytries in Kalymnos. The island of Telendos is known for its small harbor with fishing vessels and the shady 1-kilometer stretch of beach next to town. For those willing to walk a bit, Potha and Paradise Beach are not far away. Here, you can see underwater ruins of a city from before the early Christian period, or hike to Christian necropolises or basilicas.
Spetses
Spetses sits in the Saronic Gulf, an easy trip from Athens, which makes it another favourite for a weekend away. Private cars are kept out of the old town and the area around the main harbour, so the streets stay calm. People get around on foot, by bicycle, or in the horse-drawn carriages that wait near the port. The island is known for its neoclassical mansions and its part in the Greek War of Independence, and the grand Poseidonion hotel still looks out over the water. Cafes, quiet coves and a slow pace make it easy to spend a day or two here without ever reaching for a car.