My suggestions to travel in Beijing:
Day 1
Arrive at Beijing, and have a free day in the afternoon.
Day 2
Tian'anmen Square, Forbidden City, Temple of Heaven.
Day 3
Great Wall at Badaling(it takes one whole day to Simata,a part of original Great Wall, Badaling is crowded with tourists), Ming Tombs.
Day 4
Summer Palace in morning, free in the afternoon.
It's easy to arrange charter bus, restaurant, hotels and tour guide in Beijing.
PS: Hi, Nurlailani, I've sent you a email, please check your mailbox.