If you love hiking, then its worth having a look to Porto Timoni, which is one of the most instagrammed part of the island.
Its better to rent a car to arrive there because the distance is quite far from center and the roads are very narrow for buses. Park in the village (or just outside) and walk down to the beach for a 30-minute stroll. The beach itself is fantastic for swimming and snorkeling; just bring a picnic lunch, lots of drink, and sunscreen with you, because the beach is not organized, therefore there are no facilities around.