Equestrian Ride on Ferber Preserve, August 20th by FHBP on August 6, 2017 with No Comments Join OCTA on Sunday, August 20th (9 AM – 10 AM) for a one hour (moderate to strenuous) hike on the O’Neill Oaks Preserve. The Ferber Ranch Preserve is a 399-acre parcel located northwest of the City of Rancho Santa Margarita in Trabuco Canyon. Register to reserve your spot for this equestrian ride. BYO Horse.