From Express 83 in Alamo, take Alamo Road (F.M. 907) south 7.3 miles to where it dead-ends at Military Highway (281).
Turn east (left) on Military Highway and go 7/10ths of a mile to Tower Road.
You'll pass the entrance to Santa Ana National Wildlife Refuge on your right.
Turn south (right), and go approximately 250 yards-- you'll see the gate to Casa Santa Ana on the right.