Dallas:
VisitDallas.com: The official tourism website for Dallas.
Dallas Museum of Art: Dallas' own fine art museum.
The Dallas Cowboys: For any football fans out there!
San Antonio:
VisitSanAntonio.com: The official tourism website for San Antonio, TX.
San Antonio on Wikipedia: Everything everyone wants you to know about San Antonio.
The Alamo: The one mission everyone should visit in the city!