By the time of LSAF there is a bunch of stuff to do outside in Dallas. I think Southfork still does tours. Zoo. Museums. JFK stuff. West End, Deep Ellum, Arboretum, The Park over the Expressway, Meyerson, the list goes on and on. I came to Dallas in 1984 and there was lots then, but even more now. Like mresseguie says we need some input to point you to the right venues. Since you're already in Austin you may find it a hard sell to get your wife to come to Dallas. Austin is a very cool place anyway.