i am coming to china for 5 days and may be 2 days in beijing what all can i see in 2 days in beijing

hii i am coming to china for 5 days and may be will spend 3 days in shanghai and may be 2 days in beijing what all can i see in 2 days in beijing accept the great wall which i surely want to see please do help me out and 1 more thing was i was looking at flight tickets its really expencive how much would it be to travel from shanghai to beijing and is there any train services that you could recommend thanks