The park features a historic adobe ranch house built in 1823 by the recipients of the first Mexican land grant in San Diego County. The house was enlarged in 1862, and the building and site now comprise a National Historic and Archaeological District. The preserve also offers hiking, biking and equestrian trails and a wedding and reception area.
Take Interstate 15 to Mercy Road exit. Go west on Mercy, right on Black Mountain Road, and left at the first light. Follow the entry road to the Ranch House parking area.
http://www.tripleblaze.com/trail.php?c=3&i=6711