This study focuses on exploring how restorative urban design can contribute to sustainable tourism and mental health well-being. Despite growing research on sustainable urban environments, few studies integrate ecological psychology, public health, urban policy, and tourism to address overtourism’s impact on restorative spaces and promote inclusive planning. Methodology: The study uses a theoretical and critical approach with qualitative case studies of Singapore, Ljubljana, Barcelona, and Vienna, selected for their diverse restorative urban models, including Singapore’s green infrastructure, Ljubljana’s pedestrian zones, Barcelona’s public spaces, and Vienna’s historic parks. The analysis examines green spaces, quiet zones, and human-scale cultural areas to enhance well-being. Results: Restorative urban design reduces mental fatigue and promotes emotional well-being, making cities more attractive as destinations. However, overtourism risks undermining these benefits through overcrowding, requiring socially just urban planning. Contributions and perspectives: The conscious incorporation of restorative principles into tourism design serves public health and sustainability, contributing to more livable cities. The presented framework aligns social justice with tourism innovation, offering urban planners guidance and a basis for future research on sustainable urban tourism and post-pandemic recovery.