International tourism arrivals have been steadily increasing, leading to emerging and potentially intensifying problems related to high tourism activity at Lake Constance. This shows the need for visitor regulation. This thesis aims to develop potential measures for visitor regulation with the Bodensee Card PLUS (BCP), the experience card of the Four-Country Region. Through extensive analysis of BCP card user data and the identification of visitor behavior, including attraction preferences, visit frequencies and visitor flow patterns, the study provides insights into possible visitor regulation measures. The findings reveal a tendency to combine top attractions with other attractions and highlight high-er user concentration in the western part of Lake Constance, while the Untersee re-gion and areas in the Austrian and Swiss parts have limited BCP usage. Proposed measures include targeted marketing, redefining top attractions, expanding offers in less frequented regions and times, and providing information on potential overcrowd-ing. While direct measures implemented solely through the BCP were found to be less suitable, indirect approaches offer promising solutions to manage visitor flows, alleviate overcrowding, and enhance visitor satisfaction. Further research and stake-holder collaboration are necessary to evaluate the effectiveness of these measures and provide general insights into visitor regulation throughout the entire region.