Question #1: Beijing or Bust?

Hello again! So, three girlfriends and I are thinking of going to Beijing this weekend...what would be our last weekend in Nanjing. We are planning on taking a 9 hour train ride in a hard sleeper for about $80 (round-trip) on Thursday night, touring all day Friday and Saturday and leaving on another hard sleeper on Saturday night. We would only have to miss one day of clinic and only have to pay for a hotel on Friday night. We hope to spend 1/2 day at the Great Wall and 1/2 day at the Temple of Heaven and then explore the Forbidden City for one full day...any thoughts on this?