The last time I was in San Antonio, I drove the Mission Trail and visited several eighteenth-century missions, including San José, Concepción, and Mission San Juan Capistrano. And, of course, I visited the most famous of them all,
San Antonio de Valero, named for the Egyptian churchman St. Anthony the Great and Baltasar de Zúñiga y Guzmán, marquis of Valero, a hero in the war between the Habsburgs and the Turks and the Spanish viceroy of New Spain at the time the mission was built. The mission is better known by another name.
Surf over here for more information about the missions.
Also of note in San Antonio is VFW Post 76, the oldest post in Texas.
It is on the river walk but away from the tourist fray.
It is open to the public and does serve beer and wine at VFW prices.