Hi, I went on this trip on Sept 23 last year and had a wonderful time. My favourites were Forth Worth (cowboys and cattle! San Antonio (the alamo, sailing on and eating by the river, and the ranch!) and of course New Orleans, (all that jazz and the dinner cruise on the Natchez.
I have to say it did rain in Fort Worth and Austin but beautiful everywhere else - very hot in New Orleans.
Have a lovely holiday!
Regards, Pat