The Pena Adobe Historical Society was established in 2004, staffed by volunteers, this nonprofit organization is committed to preserving the Peña Adobe, California historical landmark #534. Located in Vacaville, California, the park includes the Mowers-Goheen Museum, the Willis Linn Jepson Memorial Garden, Indian Council Grounds and picnic and recreation facilities.

Today this gateway to Vacaville is open, free of charge, the first Saturday of the month February thru December, and private tours upon request with interpretive programs provided by the Peña Adobe Historical Society.