From San Antonio:

 I-10 East towards HST, Exit 601 FM 775, Turn right, go 2.5 mi to Sweet Home Rd. Turn hard left, go about 2.5 miles after electric substation turn left onto Woelke Rd. go EXACTLY 1 Mi. at mailboxes, Cowey Ranch Rd, turn right, 3rd house on left. 
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From Houston:

 I-10 W towards SA, Exit 601 FM 775 Turn left go 2.5 mi to Sweet Home Rd. Turn hard left, go about 2.5 miles after electric substation turn left onto Woelke Rd. go EXACTLY 1 Mi. at mailboxes, Cowey Ranch Rd, turn right, 3rd house on left.