Instead of the (six flags like) oil derrick you could use an oil pump which is much more common a site now a days.
But more important would be a super-sized Alamo.
and an arena with live rodeo shows.
Bud Light is popular drink in Texas, but more "Texan" would be Shiner Bock
or Lone Star. And don't forget about a good BBQ resteraunt. If the Alamo didn't bring em in the smell of the BBQ definately would.
Also you would need some Texas Rangers walking around to keep the peace.