TV Tower
If you get chance go up the TV Tower to the revolving restaurant. The views are great all over Berlin, as long as the weather is good. The restuarant is very much in a 1970's theme with all the decor and menu. I think this is more a lack of updating rather than a 70's themed restaurant. From the top of the tower you can plan a route through the city and see all the people in the platz below looking like little ants. Get to the tower early as the queues build up, especially around lunch time.