When ariving on Koh Tao by Lomprayah you first enter Koh Tao from this pier. Other ways to get here are Seatran Discovery and Songserm slow boat. Night boats to and from Chumporn, Suratthani and Koh Phangan can get you here for less money and at night so you can get some sleep while travelling.
Wikipedia:Ko Tao (also often Koh Tao, Thai: เกาะเต่า, Thai pronunciation: [kɔ̀ʔ tàw], lit. "Turtle Island") is an island in Thailand located near the western shore of the Gulf of Thailand. It covers an area of about 21 km². Administratively it forms a tambon within the district (Amphoe) Ko Pha Ngan of Surat Thani Province. As at end 2006 its official population is 1382 . The main settlement is Ban Mae Hat.The economy of the island is almost exclusively centered around tourism, especially scuba diving.Ko Tao was named by its first settlers for the island's turtle-like geographic shape. Coincidentally, the island is an important breeding ground for Hawksbill turtles and Green turtles. Development of tourism has negatively impacted the health of these grounds but a breeding program organised in 2004 by the Royal Thai Navy and KT-DOC, a coalition of local scuba diving centres has reintroduced hundreds of juvenile turtles to the island's ecosystem.