how should I route my visit during Ist week of March 2015 for maximum one week?

For the night stay in Guangzhou, you can visit the Canton Tower, and have a night cruise on the Pearl River.
In Suzhou, you can visit Classic Gardens of Suzhou, Humble Administrator’s Garden, Lingering Garden, Blue Wave Pavilion, and Couple’s Retreat Garden.
In Wuxi, you can go to Taihu Lake and Li Garden.
In Shanghai: you’re suggested to go to the Bund, Nanjing Road, People’s Square, Xintiandi, Oriental Pearl TV Tower, Shanghai Museum, and Zhujiajiao Water Town.
In Qingdao, you can visit Zhan Bridge, Qingdao Number One Bathing Beach, and Guest House.
IN Zhengzhou, you can visit Yellow River Scenic Area and Yin Xu.

To tell the truth, you have planned too many cities in your plan. Considering the transportation time, you may don’t have much time to view these cities actually. Besides, your plan of book a hotel for 3 nights in Suzhou, and cover Wuxi, Nantong, and Shanghai in day trips and stay back in Suzhou at night would make you tired. So you’re suggested to give up Wuxi and Nantong City in order to fulfill your visit in others.

Enjoy your journey!