Ernesto Rodriguez III is one of the guides profiled in “Meet the Texperts! The State’s Best Tour Guides Want to Show You Around.” Since he started working at the Alamo more than 25 years ago, when he was a graduate student at St. Mary’s University in San Antonio, history interpreter Ernesto Rodriguez III has shared the story of the Spanish mission with hundreds of thousands of tourists from around the world. He’s also helping shape the narrative of the landmark’s 300-year history at the Alamo Visitor Center and Museum, which is scheduled to open in 2027.TM: Have you changed how you present this history to people over the years?ER: In 2005 I became a member of the Professional Tour Guide Association of San Antonio, and…