joe2002,
If you are looking for places to go, San Antonio has the Riverwalk, the Mexican Market on Commerce Street, The Alamo and Sea World. Dallas has many attractions if you fly in to Love Field, Addison, or Arlington like Six Flags, Great Night Clubs, and Restaurants. There is Lake Front in New Orleans where you can go to the French Quarter. South Padre Island and Galveston Island are places to go for the beach. Albuquerque, Santa Fe, and Taos are great places if you want to see New Mexico too.
That should chew up a good chunk of your 50 hours.
Take Care,
Capt. Richard J. Gentil, Pres.
Naples Air Center, Inc.