This chapter delves into the strategic application of system methodology, including system dynamics, systems thinking, and modelling, in developing an innovative governance model tailored to tackle accessibility and cultural tourism challenges across diverse sectors and facilities. The demands for accessible and culturally enriching tourism experiences call for fresh visitor engagement and inclusion approaches. This chapter presents a governance framework grounded in collaborative principles that recognise the complex relationships inherent in tourism systems. We explore how various policies shape tourism development by examining key influences and their underlying connections. The content draws on system dynamics and systems thinking to examine the intricate relationships within tourism. The methods reveal that successful tourism governance depends on active participation from government agencies, tourism organisations, cultural institutions and local communities. Their collective involvement shapes both policy development and implementation. Reductionism and linear thinking in tourism management systems often fail to effectively address the complexities and interdependencies within the tourism industry, which underscores the significance of collaborative contributions from policy makers, industry practitioners, and academic researchers in developing accessible and sustainable approaches to cultural heritage tourism management.