Abstract: A computer system identifies data representing interest of users in a plurality of geographic sites, such as images of geographic sites submitted by people to public photo sharing sites. The system generates a “heat map” representing densities of the interest data. The system generates a route from a starting location to an ending location. The route includes at least one of the plurality of geographic sites, even if the route is not the maximally efficient route from the starting location to the ending location (measured, e.g., in terms of the total time required to travel the route or the total distance of the route). The system favors high-temperature sites for inclusion in the route, but ensures that the route does not deviate too far from the route having the shortest possible distance between the starting location and the ending location at the expense of including high-temperature sites.