Suggestions for visiting China

Traveling to China for 2 + weeks in mid-April next year.

We're pretty detailed planners in our logistics to avoid crowds when possible.

We have flexibility as we put our itinerary together - I would appreciate opinions on suggested day(s) of week / time of day for:

Trains: What day(s) of the week / time of day is best to travel on the following routes with least number of passengers?

• Beijing to Xi'an
• Xi'an to Chengdu
• Guilin to Zhangjiajie

Main attractions: What day(s) of the week / time of day is best to visit the following attractions with least number of people?

• Forbidden City

• Temple of Heaven

• Mutianyu Great Wall

• Summer Palace

• Terracotta Army Museum

• Giant Wild Goose Pagoda

• Chengdu Research Base of Giant Panda Breeding

• Zhangjiajie National Forest Park

Thanks!