I took the ferry this afternoon to the islands, getting off at Lopud for a couple of hours. M/S Postira runs 4 times a day from Dubrovnik to Kolocep/Kalamota, Lopud and Sipan. The first 2 islands are blissfully traffic-free. The Postira I discovered was built in 1963 and is 335 GRT. An invaluable ferry linking the islands and at 18 kuna (2 euros) one way to Lopud is an enjoyable 45 minute run.