San Diego is a coastal city in Southern California with a mild climate, a long military history, and a range of neighbourhoods, attractions, and natural landscapes that draw millions of visitors each year. This AI-generated guide offers a factual introduction to the city, covering its history, geography, and culture alongside practical topics such as transport, food, accommodation, and popular destinations. Whether you are planning a visit or simply want to learn more about one of California's largest cities, this book gives you a clear and straightforward overview of what San Diego has to offer and what you can expect when you explore it.