I was there with my wife last year stayed just outside Skiathos town, in the evening got the ferry into the town and ferry home at around midnight, nice restaraunts and places to eat, hired a car the island is small so 2 days you will see everything, there is a beautiful monastery on the mountains above Skiathos it as well worth the trip the views are brill and we had lunch up there overlooking the island, and we also hired a boat and went to the islands of skiathos and had lunch over there, peaceful and chilled place stay away from the main beach it is too overcrowded supposedly one of the best beaches in the med.A week was enough, people friendly.Enjoy.