Spatial based tourism behavior shows the relationship between visitors with the land and services environments. In the 1990s a tourism attraction systems model was proposed as a theoretical framework to answer this research question; this concept has been then enriched and updated by employing travel network concepts after the eruption of users of mobile IT (Information Technology). The description of general or aggregate patterns of tourism movements in a given area and their underlying network structures are central for these characterizations, they are referred to as Strategic Visitor Flows (SVF). This research uses data recorded during a test carried out in collaboration with Swisscom-the major Swiss mobile company and consists of an anonymized and highly aggregated mobile phone data set. The aim of this exploratory study is to show there is link between the relative importance level of attractions within a tourism system network and the length of stay of the visitors.