A curriculum on English for cultural tourism communication was designed, developed, and implemented for Thai adult learners in Doem Bang Nang Buat, Suphan Buri, based on adaptation of the grassroots model (Taba, 1962) and relevant research. This study focused on measurement of the learning outcomes and satisfaction levels of Thai adult learners with an English for Cultural Tourism Communication course. Participants were 21 adult learners living in the community of Doem Bang Nang Buat in Suphan Buri. Data were collected through pretests and posttests, a questionnaire, and participant observation, and analyzed using descriptive statistics such as mean and standard deviation. Content analysis was also applied. The results indicated that the learning outcomes of the adult learners improved significantly as the posttest mean scores were higher than the pretest mean scores at the statistical significance level (p < 0.05). The satisfaction levels of adult learners with the course were rated overall as very satisfied regarding teaching competencies, materials and methods, activities, learning facilitation, and knowledge and understanding of lessons. The study suggests that an English language development curriculum for adult learners should concentrate on learner needs and interests with the aim of presenting everyday English situations in an effort to enable learners to apply English language knowledge and skills to their professions. Furthermore, collaboration between native and non-native English speakers along with the utilization of technology in a positive learning environment is seen as necessary to enhance adult learning.