La Manga del Mar Menor is a spit between the Mediterranean Sea and the Minor Sea. The dimensions of this sandbar are about 20 km length and about 100 m of average wide, with only one access at South by landside. Due to its natural attractive, beaches, weather, gastronomy and diversity of leisure options, La Manga is the main seaside tourist town in the Region of Murcia (Spain). It is an attractive area, mainly in July and August, when traffic problems increase significantly. Note that, because of its dimensions there is only one access route and one exit route. This physical limitation makes congestion worse because there is not enough space to alternative routes. Moreover, all external effects related to traffic, such as noise and pollution, also increase. These effects damage the initial quality of life of this area and cast serious doubts on his sustainability.A Sustainable Urban Mobility Plan (SUMP) has been developed at La Manga in order to encourage sustainable mobility through a rational use of the private car and to ensure and make easier the intermodality among public transport, bicycles and pedestrian areas. Two packages of measures have been developed. Specifically, infrastructural measures focus on improving sustainable mobility. For example, a dissuasive car park near to intermodal area to connect all transport mode easily, measures to improve fluidity of local buses or safe cycle-lines. All these measures are evaluated economically. The other package of measures is focused on economic measures, such as intermodal transport card or environmental taxes. These measures are described qualitatively.Currently, the local government is studying all proposals in order to agree on clear responsibilities and, allocate budgets to put them into practice, to transform La Manga in a place with quality of life throughout years.