Can you help with this assignment?

Help me study for my English class. I’m stuck and don’t understand.

MLA guidelines. Length: 1,000-1,500

For this option, you need to write a descriptive essay with a strong controlling theme about a place in nature that is special to you or that you would like to explore, such as a stream or a wooded area that you enjoy. You should bring this scene to life for readers with vivid images and descriptions, conveying to readers through your descriptions the special qualities of the place. You also need to include a strong controlling theme, a clear main idea about the place that is suggested by the descriptive details you choose. You should avoid describing a vacation spot or day-trip that you remember in terms of a simple chronology of events. Essays on such subjects often lack originality and the “personal” perspective of the writer. They often end up sounding like advertising material for the place. Instead, choose a place that has a more personal significance, a place that is special to you and that you would like to share with others. You may also refer to the student sample essays in your book (e.g., “Family Portrait”).