Road Trip Advice: Vegas - San Antonio

So, my wife wants to take a leisurely drive from Las Vegas, NV, to San Antonio, TX, and back again. Evidently from the map we have a choice of three different main routes, so we can do one on the way there and another on the way back. We can of course diverge from these main roads to see anything particularly interesting. So, peoples, any suggestions as to what we should see on the way, and on which two of the three routes we should take? N.B: My wife is particularly susceptible to heatstroke and suchlike, so, alas, we cannot go hiking around the desert in midsummer. (I am fond of her and would like to keep her.)Thank you.

C'mon, people, a little help. This isn't easy. I just looked up things to do in Fort Stockton. #1 is have your photograph taken with the sign saying Welcome To Fort Stockton. I mean, I'll do it, but it'll never compete with the giant lemon in Lemon Grove, California.God, Texas is boring.

Thanks. I'm coming to the conclusion that West Texas is just awful. There's just this vast tract of nothing in particular between El Paso and San Antonio which is boring to cross and must be absolute hell to live in.The corresponding list of things to do in Saragosa has nothing on it whatsoever. Perhaps they should get a sign.