From Interstate 35, take the Walters Street Exit and go north to Fort Sam Houston.
NOTE PFSH operates from the Stilwell House on Fort Sam Houston, an active military installation. Access is controlled. Visitors not affiliated with the Departent of Defense must be on official businees to be granted access (a museum visit or event at Stilwell House is official business). Stop at the Access Control Point and present a valid drivers license or passport. Provide full name, date of birth, drivers licence number and state of issue. When the credentials are verified, the visitor will be issued a temporary pass. Below are directions from the Access Control Points to Stilwell House.
GPS locations (from Google Earth):
Access Control Point Walters Street
Lat 29.444992 degrees Long -98.450565 degrees
Lat 29.444383 degrees Long -98460349 degrees
Go to the Security Forces' website for details: http://www.jbsa.mil/Portals/102/Documents/JBSA-FSH%20Visitor%20info/AFD-140124-079.pdf