The study below treats one of the negative factors of the tourism development, i.e. criminal activities. Their increase in tourist centres may serve as one of several research standards concerning the touristic function. The municipality of Władysławowo was used as an example to analyze the criminal factor. On the basis of internal statistics provided by Władysławowo police covering the years 2008-2010, we analyzed the statistical data according to the types of crime, police districts and the period of time (months, weekdays and hours). It is clear to see the negative function of tourism correlated to criminal activities, as 30% of crimes take place in three police districts of the municipality of Władysławowo in the summer months. This has to do with the enormous inflow of people into the area of several of the villages in the Władysławowo municipality, where its inhabitants and tourists become an object of criminal activities. This implies the need for an increased number of police patrols in order to ensure and promote safety.