This document summarizes research on modeling tourist behavior on guided walking tours to inform the design of digital mobile city guides. The researchers observed three guided tours in Brighton, England during the Brighton Fringe Festival. They analyzed aspects of the tours like the guides' behavior, visitors' characteristics and behavior, tour content and structure, and the interaction between guides and visitors. The results indicated that tours are multimodal and multidimensional, and mobile guides could help support this. The researchers plan to conduct follow up focus groups with volunteers who take professionally guided tours to further discuss experiences.