Local tour guides' English speaking competence determines inbound international tourists' travel experiences. This study investigated student tour guides' English learning by adopting role-play tasks. The communicative tasks were designed to explore how real interactions prepared English as Foreign Language (EFL) learners to become cultural ambassadors who introduce Taiwanese features to the world. Twenty-nine students were recruited from an "English for Tourism Purposes" course to interact with international students who acted as tourists. The student tour guides took turns introducing a topic unique to Taiwan. Data included recorded conversational interactions between the international and local students, comments on tour-guiding performances, and reflective notes. Adopting conversation and thematic analysis, the researcher analyzed the objective learning outcomes by observing how students performed in the tour-guiding tasks and examined the subjective viewpoints from the participants' reflective notes. The results revealed distinctive spoken features for communicative competence and the benefits of gaining a deeper intercultural understanding of how to communicate Taiwanese culture in English and developing various communication skills for interacting with foreigners. Pedagogical implications are discussed in terms of the design of English for Tourism teaching.