Ask for advice about my Beijing tour

Hi, experts, I'm planning my visit to Beijing. Could you please give some advice on my itinerary?
Day 1: Great Wall, Ming Tombs
Day 2: Tiananmen Square, Forbidden City, Prince Gong's Mension
Day 3: China Science and Technology Museum, Water Cube
Day 4: Summer Palace, Tsinghua University, Peking University

Thanks very much in asdvance.