Beijing is rich in tourist spot; Forbidden City, Silk Market, Military Museum, Great Wall, temples, etc.......
The easiest way to visit the Great Wall: call an agent and buy a tour, they pick you up at your hotel, take you to Ming Tomb, have lunch (included), visit some Jade market and go to Badaling with The Great Wall. This is a long tour, you depart around 8 AM end return around 5 Pm.