A very cheap way to see some of the many sights of Berlin
The bus part of the tour is quite good as you can just ride it for 3 days and watch Berlin. I loved the recorded audio, except that I don't think the Berlin Tower is the tallest structure in Europe anymore, its the Shard in London. Plus one of the embassies are flipped. It should say the Turkish embassy then the South African embassy.
I got a chance to see parts of Berlin I had not seen before so this worked out well; the staff is polite and the buses show just about every ten minutes. Watch for traffic diversions as you will miss parts of the tour. But if you do, just hop on and off again. You can use it as your transportation around Berlin :-).
The Spree river cruise was not running for a week, but I did not find out until I got off walked around looked for it, and did not find it. However, I was offered any other tour I wanted, so I picked the asisi promenade which is at Checkpoint Charlie. This museum is worth visiting as well. So I have to come back and do the river cruise