Nature’s Classroom Institute Mountain site is in the San Bernardino Mountains at Angelus Oaks. Just above the South Fork Santa Ana River NCI Angelus Oaks offers mountain hiking trails, alpine forests, river exploration and full access to the spectacular Jenks Lake. NCI Angelus Oaks has fully winterized cabins, large dining room and break out spots set with in the backdrop of the San Bernardino Mountains. Escape the valley and experience a true environmental program where students have the opportunity to explore this spectacular environment. “A true mountain experience” Located with easy accessibility of LA and San Diego and surrounds.