What are some special things one can do or see in Berlin? Would prefer something not very commonly known?

Question

GET A FREE COPY OF MY BOOK: I am writing a book on travel and want to talk about places and things to do which are not very commonly known. If there are special stories, anecdotes or unconfirmed myths about a place, it would be appreciated. I promise to send a free copy of the book when published (around December 2006) to all those whose information I use, no matter where you are in the world. - Ajay Jain, India, [e-mail]

Answer 1

I would suggest to do a city tour by bike. You can do themed tours around the former East-Berlin etc. I am going on one next week! :))

Answer 2

GO HORSE RIDEING WITH THE BRITISH ARMY AT THE OLIMPIC STADIUM