Coral reef tourism is a popular activity for travelers and the popularity is likely to increase rapidly. This activity has several effects to the coral reef such as anchoring, stepping and picking up the living things which dwell around the coral reef area. Previously, damages caused by traveler's behavior were always neglected until diving activity has become much more popular. There is a great concern that the coral reef tourism will create more damages than before. According to knowledge, conscious and behavior on touching corals or other marine organisms. The research found that most travelers, who did not use knowledge and conscious handbook with rope trail, were aware of impacts from coral touching. And only a half of travelers have proper knowledge about the corals. In average, travelers who did not use knowledge and conscious handbook with rope trail, touched the coral 17 times per 30-minite diving period. While those who used knowledge and conscious handbook with rope trail touched the coral only 8 times for the same diving period. Research also found out that the travelers touch corals with their feet more often than their hands. And from the questionnaire most traveler had no diving experience and never been to Koh Chang before. That made travelers nervous when they had to snorkeling. Consequently they had to step on corals in order to control their body, and walk to shallow area. All the above behavior causes damages to corals and the other marine organisms. The study recommends that new rope-trail should be installed where the water is at least 2 meters deep in order to prevent travelers stepping on corals
