Quote from sunnyjohn
One word.... Parkland.
I agree. And if you are under 40, I'd also encourage you to consider "Big Baylor" (BUMC in downtown Dallas). HCA hospitals mostly have internships--and you could probably get that info from HCA itself.
You might google for hospitals in and around the cities you are considering (e.g., [Dallas hospital]), then contact each to see if they have internships at all, and if so, if there is one that interests you. If so, you can easily collect the sort of info that you'll need to decide if that's where you want to go. This sort of search will generally also turn up hospitals in more suburban or (sometimes) rural areas nearby.
If you are bilingual (particularly Spanish English), that's a huge plus, especially in Texas. Believe it or not, potential interns sometimes need an edge.