This chapter provides a conceptual framework on leveraging various sources of big data to monitor and forecast tourist activities and discuss the potential sources for big-data forecasting. Managing and governing a complex system is notoriously a daunting task that requires a sound knowledge of the structural and dynamic characteristics of the system. The system evolves continuously redefining its configuration and functions; it may exhibit an intricate mix of ordered and disordered behaviors and show emergent phenomena which are generally surprising and, at times, extreme. Statistical physics is one of the fundamental fields of physics, and employs statistical methods for addressing physical problems that concern systems with a large number of components. A reliable model, especially when dealing with a complex system, needs continuous interactions between researchers and empirical issues. The object of study in nonlinear dynamics is a time series that contains a certain number of quantities related to some behavior of the system under investigation.