I visit here frequently when we are in need of a rainy day activity or have not attended in some time. The museum has rotating exhibits throughout the year, as well as permanent exhibits. My favorites tend to be the dinosaur exhibits and the minerals and gems exhibit. Each time we go I learn something new that I had missed previously.
The museum is quite large and requires a lot of walking. There are elevators for easier access, but plan on taking some stairs too. It makes for a good couple of hours of exploration and fun.
I've attended events held at the museum as well, including the 21+ nights. These tend to fill up quickly, so I recommend getting your tickets early! These events are a great way to experience the museum and network with other like-minded individuals.