Museum Hours: 9:30 a.m. – 4 p.m., Wednesday – Sunday
Guided Adobe House Tours: 12 p.m. Wednesday – Sunday and 2 p.m., Saturday – Sunday
Self-Guided House Tours: 9:30 a.m. – 4 p.m., Wednesday – Sunday
Wedding Tours: Wednesday – Sunday, by appointment

Note: I went after hours therefore have no photos of the inside of this place which is like 90% of the trip.

From Wikipedia: Rancho Guajome Adobe is a historic 19th-century hacienda (and now a historic house museum) in Rancho Guajome Adobe County Park, on North Santa Fe Avenue in Vista, San Diego County, California. Built in 1852-53, it is a well-preserved but late example of Spanish-Mexican colonial architecture, and was designated a National Historic Landmark in 1970.It is also a California Historical Landmark and on the National Register of Historic Places.

History: The adobe was built in 1852 and served as the headquarters of Rancho Guajome, a Mexican land grant. Abel Stearns had given the rancho to Ysidora Bandini (sister of his wife Arcadia Bandini), as a wedding gift when she married Lieutenant Cave Johnson Couts in 1851. It was built with the profits from the cattle boom of the 1850s, when many California ranchos supplied the Gold Rush miners and associated new American immigrants with meat and leather.[4]

Couts was appointed sub-agent for the native Luiseño people (San Luis Rey Mission Indians) in 1853. He used their labor to improve his properties in the area, including this one and nearby Rancho Buena Vista and Rancho Vallecitos de San Marcos.

Beginning in the 1970s, the county undertook a major rehabilitation of the property, which was completed in 1996. It is now the centerpiece of a county park 112 acres (45 ha) in size. Guided and self-guided tours are available, and the park facilities are available for special events.