What parts? San Antonio has a lot of sites to see like The Alamo and the Missions National Historical Park. And the caverns that you can visit the Witte Museum. Houston has the Space Center if you're interested in rockets, or the Natural Science Museum to see more dinosaurs like in San Antonio. In Corpus Christi, you can see the USS Lexington, one of the most prestigious Aircraft Carriers in World War 2. American Football is one of the most important sports in the state, if you can find a collegiate or NFL game play during your visit, I recommend checking them out. If you're in the Dallas area, you can find a museum for the Dallas Cowboys, one of the most prestigious teams in the NFL.