I agree on the Riverwalk and Mercado in San Antonio (and Alamo is right there anyway).
In Dallas, if you like this sort of thing, the Dallas World Aquarium is fantastic, with it’s rainforest exhibit and its not as large as going to a zoo. I took some fantastic photos there last fall with my son and grandson. Some of the birds are flying freely, plus they have a cool aquarium “tunnel” where sharks and such swim around and overhead. Of course it’s downtown Dallas. We took the train in which I don’t think I would do again. I’m not sure how far it is from Dealey Plaza as it’s been a long time since I lived in the area.
We took the train in which I dont think I would do again.”
We stayed in Plano and took the train to the State Fair on the same day Oklahoma and Texas were playing in the Cotton Bowl. Only went because it was on my bucket list. I’m an OU grad but chose to wear neither red or burnt orange that day, cause I now live in Texas. Train trip was delightful and non-stop to the Fair, just crammed with football fans. Didn’t realize there were so many things that you could wear with cowboy boots.
Other than the fair, wouldn’t give you a plug nickel for Dallas - love Fort Worth though.