Accommodation zones, beaches, and viewpoints on islands # 4 and # 8 are connected by sandy foot paths with well marked signs, but don't forget to bring a torch if staying over night.
If staying on the islands, the only ways to get from island to island are to take part in daily trips aboard a flat bottomed boat operated by the national park, or charter a private longtail boat. However, longtail charters must be arranged beforehand at national park headquarters at Thap Lamu pier, and there is no guarantee there will be one available. Unlike at Ko Surin, there are few longtails operating around the Similans, with most of the boat traffic being either tour speedboats or diving vessels.
National park boats run twice a day from island # 8 to # 4, leaving at 8:00 and 13:00, and returning at 10:00 and 15:00. The cost of a one-way trip is 200B. Snorkelling excursions on national park boats depart only from island # 4 and depart twice per day. The first trip is from 11:00 to 13:00 and the second from 13:30 to 15:30. These typically visit some of the more obvious and easily reached snorkelling sites around islands # 6 and # 9, and the cost runs between 200 and 300B. Note that the national park is not a tightly run organisation and this information is subject to change.