Abstract
We focus on the goal of designing recommender systems (RSs) for sustainable tourism itinerary planning. In particular, we focus on the problem of rearranging tourist flows in order to protect popular destinations from overcrowding, as well as to stimulate the development of less mature destinations by distributing tourists throughout the territory. This topic is quite new in the recommendation literature, although it is well known in the tourism literature. We aim to transfer concepts from the field of tourism to the field of RSs in order to improve tourism development. Our approach is to take into account the goals of all the active stakeholders, and not to focus solely on tourists. Here, we propose a multistakeholder utility model for travel itinerary optimisation. We experimentally show that it is possible to mitigate the aforementioned environmental issues with a slight decrease in user satisfaction utility.