This study aims to investigate the effects of implementing active learning activities through an interactive learning platform, ClassPoint, to improve the English vocabulary, grammatical retention, and motivation of Thai undergraduate students in the field of hotel and tourism. The one-group pretest-posttest research design was used. The population was 20 third-year undergraduates enrolling in the hospitality program at a university in the central part of Thailand. The convenience sampling technique was used to select the participants. They included 15 students, with the majority at the A1 CEFR level of English proficiency. The instruments used for this study included pre-, post-, and delayed post-English achievement tests to examine their English proficiency. The questionnaire and focus-group interviews were also used as research instruments to elicit their motivation toward learning English. The results showed that the students were able to retain vocabulary, but they did not demonstrate grammatical retention after the intervention. However, there was a significant increase in motivation in English learning. They were more confident in their language skills, and the active learning activities integrated with the ClassPoint application could inspire them to further develop their language proficiency for their personal interests and future careers.