We recently spent an afternoon at the Museum of Native American History, and enjoyed the experience. Our group was two adults and two children, ages 13 and 4.
Before even entering the front door, visitors are introduced to a giant teepee that is fun to explore. Immediately inside the entry, a mastodon skull, stuffed bear, and stuffed bobcat await. After passing a giant beautiful mural, visitors reach the welcome desk, where they receive a small transmitter to carry through the museum. This allows each visitor an interactive tour where he can hear about each portion of the collection. The stations are numbered from 1 to 115, so listening to each could take quite some time. Thankfully, for my four-year-old's attention span, we only listened to select recordings and made it through the museum in about an hour and a half.
The collection includes a large selection of arrowheads, tools, weapons, pottery, clothing (including some very impressive headdresses), and blankets.
About halfway through the museum, there is a large room with tables and chairs in case visitors require a break, and a restroom. There is also a small museum store near the entrance.
This museum is FREE and a great learning experience, but best of all, it's fun! I highly recommend this for an afternoon with the family.