Beautiful restaurant, kids play area, 3 display planes (Junkers JU-52, DC 3, Lockheed Super…read moreConstellation), viewing platform, small airport museum with interactive instruments (for young and old, entrance free), and souvenir shop (with many cool children's toys).
The overall experience is pleasant. The only thing that I didn't like was the service. But could be just that person.
It is possible to walk to and from the main terminal 1200 meters, or there is an S-Bahn (train) station very close, and there is a big car park (1.50 up to two hours, 3 euro up to 6 hours, maximum parking time 24 hours).
Restaurant: All food is between about 7.50 and 10.00 euro. Curry wurst with french fries, salad with chicken peaces, hamburger with french fries etc. Pretty expensive, but I think a little cheaper than at the airport terminal.