||The Stolowe Mts. National Park (SMNP) is located in the Sudetes Mts. in South-West Poland, on the border with the Czech Republic. The total area of the SMNP is 6,340 ha and there are around 100 km of marked hiking trails. The Monitoring System of Tourist Traffic (MSTT) in the SMNP consisted of the following specific objectives: 1) Qualitative monitoring using questionnaire-based data collection of visitors’ motivations and preferences; 2) Quantitative monitoring using 38 infrared sensors (Eco-counters) to count tourist traffic at the entrances of marked hiking trails within the SMNP border.