This paper shows the results of a teaching innovation project, which consisted in providing students with a video description task, by which they could practise their written skills in a collaborative fashion in their "English for Tourism" university studies -- which enables them to obtain a B2 level. A total of 35 adult volunteers participated in this two-month project. Following a task-based approach, and by taking techniques from of audio description, students had to write, in pairs, the script of a touristic promotion clip of Iceland, providing an attractive and accurate description of the images that appeared on the screen, that is, situations proper of the tourism industry. In the second phase of peer review, students had to assess the other pairs' descriptions, and, finally, once revised by themselves and by the teachers, they had to vote for the best ones, with the aid of a rubric that helped them identify the main landmarks to take into account (lexicon, accuracy, etc.). The results show that the students not only enjoyed the task, which increased their motivation for writing in English, but they also obtained better results in the final exam tests than those who did not participate in this collaborative task.