Tiananmen is an enormous concrete open space and itis hard to see it as a tourist attraction at times but you need to have the history of th Square firmly in your head and you realise that today's Square is a part of it's past. Now though it is peaceful and carefree on the surface but EXTREMELY hot on a summers day, no shade and little breeze. Wear a Hat.
But, see the Great Wall First. Here, you will attract vendors and "art students". It is a lot of walking but it is so historic that you have to go. So go and get it over with.