March on over to Central Texas Wing of the Commemorative Air Force, explore the site and try to imagine what being a part of the armed forces feels like.
You're spoiled for sightseeing choice when in San Marcos. Central Texas Wing of the Commemorative Air Force is an ideal place to begin here, but there are loads of other worthwhile spots to check out. Texas State University, San Marcos River, and Wonder World are close to the military installation and will fill in your day nicely.