We loved our short trip to the Nature Museum but didn't realize it was so geared toward kids. We don't have kids so we had to leave a drivers license at the door. We also got some weird looks from the other people with kids so it was a weird atmosphere and we didn't stick around for long.
There are a few areas that are obviously for the kids but the rest should appeal to all ages. We loved being able to see two owls up close, check out baby quails and then see the adult quails and see different types of snakes, turtles and miscellaneous animals. The butterfly atrium was pretty average. There weren't a lot of them flying around but it looked like they had a lot that were ready to hatch. The nature trail in the back was probably more for kids. They had some play structures set up and if you're looking for a decent length walk, it might be worth going to the park/lake on the other side of the gates.
Admission wasn't terribly expensive and we thought it was worth it just to see the barred owl and the comically tiny screech owl.