I went here with my husband for my birthday because, while I may be 24, I am still a kid at heart who loves dinosaurs and history. I don't think I've been to this museum since I was a little kid, but I have fond memories of field trips here, and as an adult this place did not disappoint.
From the moment you walk in the door, you can see cool dinosaur skeletons. It's far from an empty lobby, and the museum atmosphere is apparent immediately. A quick study of the map after paying the admission price and you'll get an idea of the best path to take around the museum.
Currently the museum has a special exhibit about the Therizinosaur. It's a cool exhibit. Besides that, there are dinosaur skeletons, the old territorial prison, Native arts and crafts, and an awesome waterfall/flash flood display.
My only complaint is that the explanations of each exhibit are sometimes a bit long and wordy (especially in the Therizinosaur exhibit). The info is fascinating but with so much to see, it can be hard to stay still and read the entire thing. Bullet points and the use of bigger headlines that summarize the exhibits more clearly could be useful.