The document outlines several platforms and theories related to tourism development planning. It discusses advocacy platforms that see tourism positively and cautionary platforms that see negatives of mass tourism. It also covers theories like laissez-faire, modernization, trickle-down, and dependency. Approaches to tourism planning include no planning, ad-hoc, integrated, boosterist, product-led, spatial, demand-led, bureaucratic, middle path, environmental, eco-tourism, participatory, community-based, pro-poor, and fair trade approaches.