Old Town San Diego State Historic Park is a popular tourist destination in California, showcasing the history and culture of San Diego from the early 1800s to the mid-1870s. The park is located in the heart of San Diego and comprises 32 acres of historic buildings, museums, and gardens.

One of the main reasons to visit Old Town San Diego State Historic Park is to immerse oneself in the rich history of the area. Visitors can experience what life was like in early San Diego by exploring historic buildings, such as the Casa de Estudillo and the Mason Street School. There are also several museums in the park, including the Junípero Serra Museum and the San Diego Presidio Museum, which offer exhibits on the history of the area.

Other points of interest in the park include the Bazaar del Mundo, a vibrant marketplace of shops and restaurants, and the Whaley House, a famously haunted building that is said to be one of the most haunted places in America. Visitors can also enjoy the park's beautiful gardens, including the Alvarado Gardens and the Cosmopolitan Hotel and Restaurant gardens.

Interesting facts about the area include that Old Town San Diego was the first European settlement in what is now California, established in 1769 by Spanish explorer Gaspar de Portolá. The park was created in 1968 to preserve the historic buildings and landmarks of the Old Town area.

The best time of year to visit Old Town San Diego State Historic Park is during the spring and fall when the weather is mild and there are fewer crowds. However, the park is open year-round and there are events and activities throughout the year, including the annual Fiesta de Reyes celebration in May and the Dia de los Muertos celebration in November.