Here is a selection of resources and Lesson Plan for the positives and negatives of tourism. There are some ready made publisher files focussing on LIC (LEDC) countries, which you can print out. There is also a powerpoint/prezi and lesson plan to guide you through the lesson.
This is a mini scheme of work for Biodiversity, it has a PowerPoint and basic lesson plan attached as well as a glossary, worksheets and specific outlines for edexcel. Although the content is relevant for most exam boards.