The cave canal (roulette) is a deep channel between the cave and the mainland. The villagers in the area used to shelter during the monsoon and to fish in the cage.

Dolphin watching spot, Donsak bay is the most abundant bay. It can be seen rare animals that are dolphins, sea turtles, dugong, especially dolphins, bottlenose dolphins, Pacific humpback dolphin (pink dolphins), Finless porpoise And Irrawaddy dolphin. Visitors to popular cruise to see the lovely of animals often come out during this time 08.00-11.00 a.m.

Thongpin cave is a small cave that is about 100 meters from the beach of Tongsai. In the past, there was a boat trip to go to the farm near Khanom, Nakhon Si Thammarat. The area is adjacent to Nang kam. When a rowing boat back home, a woman named “Thongpin” drowned and died in a gutter near the mouth of this cave. The villagers called this cave "Thongpin Cave" since then.

Dolomite caves locate at Ban Nang Kam, Donsak district, Surat thani province. Dolomite caves are coastal cave. The caves have various sizes with average width of 5 meters average height of 1.5 meters average depth of 3 meters, located along the rocky shoreline, caused by the erosion of rain and the sea water. During high tide dolomite cracks in the style of the elephant skin can be corroded very well by sea water. Once upon a time, many millions of years, resulting As caves, seen in nowadays.

Dolomite lapis (Reefs) are coastal rocks, having a different size, with the average size of 1 meter, and which are located on a rocky beach shoreline, caused by the erosion of rain, wind, and sun in the joint of the folded rock, especially in the area of the peak of the folded rock which has a lot of fractures, so that makes the rocks easy to corrode and decay. The rocks became similar to the Dolomite lapis (Reefs).

Kaochang angel Shrine (Tewada Kaochang Spirit Worship) is located in Nangkam beach. It is a small worship house that the villagers co-created for a mental anchor. If the villagers have an uneasy story, they will go to it asking the god to help them. When they have success with what they have asked for, they will fulfill one’s vow with firecrackers or by shooting the gun.

Sea grass in the cave island. It is abundant and source of food for the sea turtles, dugong, This area is an abundant aquaculture.

Dolomite pebble beach is a rocky coast , The pebble are of different size, the average size of 2 centimeters, located along the rocky shoreline, caused by the erosion of rain and the sea waters. During high tide sea water get into the elephant cracks and the rocks became to pebble, by wave energy from the beach, the pebble to roll around until the pebble are rounded.

“Thongsai nok Beach- Thongsai nai Beach” is a beach stretching along the edge of the hillside, which is a reef with small rocks and white sand. In the area there are rock cliffs and small caves which the fisherman use shady shelter.

Dolomitic conglomerates on the cliff locate at Ban nang kam Donsak district. Dolomitic conglomerates on the cliff, caused by the erosion of rain, wind and sun that make dolomite pebble, at the onset of this conglomerate, sea waves swept grain pebble into the cave, pebble dolomite cemented by calcium carbonate, mud, became dolomitic conglomerates on the cliff.