Museum of South Texas History
If I have to make a recommendation on which museum to visit in the valley...It has to be this one. I believe it is one of the biggest museums in the valley and it has a lot of interesting facts that has happened around south Texas. They have a ton of real artifacts with many displays to go with them. It's two stories with an extra exhibit (county jail). I've put up a few pictures on how they have it layed out.
Even though, at the time I went, the "County Jail" was closed for reparations, it was still worthwhile visit. This place would make a great early date!