Winston M.
Google
It's a small museum, but very high quality. Stuff for adults and kids. One of the highlights is the flight simulator experience they offer. Very detailed 737 sim, and the man running it is a very good teacher. Only 1000 yen for a session, two sessions available per hour. Very good way to pass an hour or two if you have some extra time before a flight.
Pro tip: if your coming from NRT on a weekday, the bus to here leaves from bus stand #2 for Terminal 2/3. On weekends, I believe the Soramaru bus runs, not sure about that schedule but airport info desk is helpful.