Its going to be nice weather Ron so perhaps a stroll through the Brandenburg gate, past the Reichstag and down 17th June Street to the victory memorial, then turn left and have a look at the holocaust memorial? Or walk the other direction down Unter den Linden to the museums island and the old East German TV tower at Alexanderplatz - there is a café at the top which rotates 360° in 30 minutes and gives great views of the city.