If someone says that, my first thought is that they must have flown over the State, and have not spent anytime here.
Have your friends try
TravelTex Home to start with. If they don't find anything of interest there they should do a google search using the search terms Travel Texas.
Tell your friends to bring cool clothing, it gets hot here in the summer, and a camera. They will need to take pictures to remind them of what they have seen in Texas.
__________Tom