Similan Islands: This group of rocks and islands lies 3 hours by boat off the coast of Phang-Nga, or eight or more hours by boat from Phuket. The area was declared a marine national park in 1982 and consequently remains largely undeveloped. Derived from the Malay term sembilan, meaning 'nine', Similan refers to the nine main islands in the group.

The waters surrounding the Similan are teeming with tropical fish, colorful coral, and offer exceptional underwater visibility. As a result, the diving is generally considered to be the best in the region, and compares favorably with some of the best in the world. (see more about diving here). Part of the reason for this is the very interesting submarine topography, due in part to the huge granite boulders which not only litter the shorelines, but also lie in jumbled heaps beneath the waves to depths of 35 metres and beyond. On surface the boulders, together with the lush rainforest and white sand beaches, provide a peaceful refuge.
The islands attract an increasing number of visitors annually, particularly during the high season months between December to March, when the visibility of waters surrounding the islands is at its best.

Day trips to the islands for diving and snorkeling are popular, however serious divers are recommended to come on live aboard trips to take full advantage of all the islands' have to offer in terms of diving opportunities. Dive companies operating from Phuket and Phang-Nga offer a number of tour itineraries with diving instruction for beginners. For budget travelers, the Similan Islands can be reached via national park service boat from the pier at Thap Lamu or by boat from anywhere along Hat Khaolak. Boat charters can also be organized, costs depending on the quality and speed of the vessel and the number of persons to travel.

Limited accommodation is available on Koh Miang (Island 4) where the National Park headquarters are based, but it is advised to come prepared with food and water supplies if intending to overnight there. Contact the Similan Island National Park Offices at Moo 1, Tambon Lam Kaen, Thai Muang District, Phang-Nga. 

 

Surin Islands: Surin Islands are located about 60 km off the west coast of Phang-Nga Province, well known for diving, snorkeling and hiking in the surrounds of what is designated national park area. Of the five islands that make up the group, Koh Surin Neua (north island) and Koh Surin Tai (south island) are the principal islands - lying just across a small bay from each other, and where basic bungalow style accommodation and camping grounds can be found for overnight visits.

Like the Similan Islands, Surin Islands are best visited during the months of December to March when the seas are at their most calm, and for divers and smokeless, water visibility is good. Local nature enthusiasts particularly favour these islands for the great hiking opportunities afforded here. A number of trails can be found, especially on the north island.

To reach Surin Islands, charter a boat from any of the major piers in any of Phang-Nga, Phuket or Ranong provinces. From Khaolak, charter a boat from any beachside location or zip up to the village of Ban Hin Lat for the easiest ( and cheapest!) access from the mainland