Human needs for tourism today continue to increase throughout the world especially marine tourism which is widely developed in Indonesia. The potential tourism on Gili Ketapang Island is an attractive beach and coral reef for snorkeling. Marine tourism on Gili Ketapang Island is still recently developed and needs to be managed properly. This study aims to determine the quality of tour guide services, tourist satisfaction, revisiting intention and relationship between these three variables. Tour guide service variable is explained by four indicators: communication, attitude, skill and knowledge. Tourist satisfaction variable is explained by four indicators: tourist variation, service quality, activities quality, and object quality. The research conducted on January 2019 by interviewing to 100 snorkkling tourists then analyzed use Structural Equation Modeling (SEM) model to examine the relationships between variables and indicators. Tour guide service quality and tourist satisfaction are classified as good. Revisiting intention from tourist is also classified as good. Guide service has a real influence on the level of tourist satisfaction and tourist satisfaction also has a real influence on the revisiting intention of the tourists.