Final answer:
The topic sentence of the passage is sentence 1, which introduces California as a tourist destination known for its warm weather, sunshine, and numerous attractions.
Step-by-step explanation:
The topic sentence of the passage provided is sentence 1. A topic sentence typically introduces the main idea of the paragraph or passage, offering a preview of what the text will be about. In this case, sentence 1 gives an overview of California as a tourist destination with its warm weather, sunshine, and multiple tourist attractions, setting the stage for more detailed information about specific cities and towns, including the small town of Oak Glen.