Background and objectiveTourism would be one of the important sectors for economic and regional developments throughout the world and the tourism travel demand has been rapidly growing mainly from emerging market countries (World Travel & Tourism Council, 2017). In the case of Japan, there has been rapidly increasing trend of inbound and outbound of tourism travel trend for the last decade (Japan Tourism Agency, 2015) and it is predicted that this growth trend would continue for the next decade. In contrast with such fast increase in tourist travel demand, however, dealing with visitor congestion at many popular tourist spots would be would be one of the most urgent issues in tourism management in many countries. Several famous sightseeing sites in suffer from temporally and spatially concentrated tourist demand for their lack of capacities for attraction sites or facilities.In order to establish more appropriate tourism strategies, the data on tourists' traveler behavior (e.g. tourist site destination choices, trip-chain making and tour choices, and dwelling time at each spot) would be quite informative. Traditional paper-based questionnaire survey has been widely utilized for tourists' travel data collection but it has drawbacks in terms of inaccuracy and inefficiency, particularly when analyzing tourism demand for wide-area tourism in which tourists would travel across several distant sightseeing spots in multiple days. GPSbased survey methods, which has been popular for collecting urban travel data, may have potentials for obtaining more accurate and detailed information on tourists' traveler behavior but the method has become difficult for large spatial scale analysis because of its high costs.For cost efficiency reasons, this paper explores the feasibility of a passive travel survey data collection mainly for tourists. The recent spread of information, communication and technology (ICT) services into society offers increasing opportunities to use pervasive ICT devices (e.g., smartphones) to collect detailed location and time-of-day information of travelers, without conducting any full-scale travel surveys. At present, many people (including tourists from emerging market countries) carry their smartphones with them and these devices generally contain the functionality for access to wireless fidelity (Wi-Fi). Most importantly, each of these Wi-Fi devices has its own unique media access control (MAC) address and it would thus be possible to detect the traces of their Wi-Fi access records both temporally and spatially. This Wi-Fi based continuous monitoring of tourists with sensors installed at each sightseeing spot may exhibit innovative potentials for travel data collection if we are able to trace each MAC address.There have been several applications of Wi-Fi based approach for human monitoring or travel survey. These applications include: journey travel time estimation (Abedi et al., 2015), waiting time estimation of bus passenger (Kusakabe et al. 2017), tracking of pedestrian