Family of four travelling for 3 weeks starting June 2nd to 22nd

Starting in Shanghai, travelling by bullet train to Huangshan and spending 2/3 nights, then onto Changsha by train for one night. Hopefully hiring a car (either with driver or not) and driving to Mt Tianmen for 2/3 nights. Then car to Fenghuang for 1/2 nights. Then car to Guilin for 3/4 nights. Bullet train to Guangzhou for 1 night. Train to Hong kong for 3 nights. Train to either Xiamen or Xiapu for 2 nights. Train to Shanghai for 1 night. Does this sound plausible and is it a good time frame for distances traveled and how busy will it be do you think?