Another fine option for shooting when the sun is high is black and white. The interesting light might well be long gone. Everything takes on a less than exciting cyan tone. Shadows are dark, highlights are glaring and colour pictures just don't have much to catch the eye in this sort of bright Texas sunlight. Quiet shade can help, but so can switching your mind to a black & white palette. Those dark shadows and contrasty light can work really well converted to B&W.