The main city is the ancient city of Suzhou. It doesn't have the modern feeling of a park, but it is the real Suzhou. The world-famous Suzhou gardens are mainly distributed in the ancient city. The ancient city is centered on the commercial circle of Guanqian Street, supplemented by Shilu and Shiquan Street, which constitutes the prosperity of the ancient city. Although it is not as dazzling as the park, it is so European.
Chengxi is a high-tech development zone, referred to as high-tech zone for short. Like the park, it also shoulders the great responsibility of Suzhou's economic development. There is Jinji Lake in the east and Taihu Lake in the west. Therefore, the west of the city is also the favorite place for Suzhou people, so go there to play when you have time.
This is just my personal opinion after studying in Suzhou for one year. I hope I can help you.