This study has three main purposes. The first is to examine the planning and implementation processes involved in Langkawi's development - particularly since its establishment as an international tourist destination - providing a brief account of the stages of its development from a duty-free island (1987) to Global Geopark (2007). The second purpose is to identify Langkawi's degree of marginality in terms of its livelihood assets, particularly its human, social and financial capital. The third focus of study addresses the issue of whether Geopark status has the potential to enhance livelihoods and the sustainability of island communities. Case studies of three locations on Langkawi (Padang Mat Sirat, Kilim and Pulau Tuba) are used to illustrate marginalisation in different types of locality. The results confirm that at local levels, the trickle-down effect of growth that benefits and reaches poor and vulnerable groups takes time due to the degree of accessibility of groups to resources, social and physical infrastructures and achievement in education and technical skills. In fact, the unemployment rate was significantly high for these areas, especially for Pulau Tuba due to its location off the main island. Regarding local participation based on types of employment, the results confirm little movement in terms of upward mobility. Hence, investment efforts, either by government or the private sector, are needed to revive the present economic activities with diversified concepts that are appropriate for the local community. The challenge to ensure effective participation and sustainability is a multifaceted one which requires commitment from individuals, the community and development agencies such as LADA and the District Office, to channel suitable socio-economic-driven projects to improve local livelihoods and to encourage bottom-up participation among locals by empowering them in the development and planning processes.