We recently visited the Virginia Living Museum. I highly recommend it. It is both indoor and outdoors. The outdoor portion has a large wild reserve with several animals on it, including an aviary. Indoors is the aquatic center, but has many other focuses. Basically, anything living and their habits is the museums focus. They have probably the best kids area I have yet to see in a museum. Very creative and stimulating for all those young naturalists. We had a great time, and even though I had to wobble (about 8 months pregnant) the whole time, it was well worth the energy.
(See Va. Living Museum folder in left column. for pics)