What should I know about Oklahoma now i'm in a relationship with a native from the state?

So i've been with my gf for 3 months now and I'd like to take a bit more of an interest in her home state. We both live abroad so I haven't had the chance to experience OK in person yet but we're planning on it in the new year. What info should I know about the state? What is cool about OK and what is not so cool? Feed me info