This document discusses the design principles and implementation strategies of augmented reality (AR) in tourism, exploring its definition and affiliations with other technologies such as virtual reality and the Internet of Things. It outlines the benefits of AR for enhancing visitor experiences, including personalized content delivery, while addressing challenges like infrastructure demands and user adoption. Case studies highlight the applications of AR in various tourism contexts, including museums, libraries, and location-based gaming, ultimately proposing design frameworks to improve the effectiveness of AR in tourism settings.