As public spaces are often designed based on adults’ behavioural patterns and perceptions, children’s perceptions and physical needs based on their body size have received less attention in both the design of urban spaces and urban studies. Focusing on the interpretive reproduction theory, this study aims to investigate children’s perceptions of urban spaces. Using behaviour and mental mapping, this paper examines children’s activities in public spaces as well as their mental images of such spaces. Behaviour mapping was conducted over 37 days on the Zrêbar Lake Waterfront in Kurdistan. Sketches drawn by 36 children were then analysed to identify children’s perceptions of the Waterfront. Unlike conventional methods in which children’s demands are determined through caregivers, this study focuses on engagement with children. Results indicate that two main factors of actualised environmental affordances (AEA) and safety-conscious parenting practices (SPP) have a significant influence on children’s freedom of movement (CFM) and consequently children’s activities in public spaces.