Established in 1850, the homestead of Henry N. Greenwell served as cattle ranch, sheep station, store, post office, and family home all in one. Now, all that remains is the 1875 stone structure, which is listed on the National Register of Historic Places. It houses a fascinating museum that has exhibits on ranching and coffee farming. It's also headquarters for the Kona Historical Society, which organizes walking tours of Kailua-Kona. www.konahistorical.org. Open weekdays 9-3.