As a famous historical and cultural city, Nanjing has many good places suitable for cool summer vacation. The following are some suggestions:

1. Nanjing Confucius Temple: There are many snacks and specialty shops around Confucius Temple, where you can go shopping and taste delicious food, and it is very close to Qinhuai River, where you can walk and feel cool.

2. Nanjing Purple Mountain: Purple Mountain is a mountain range in Nanjing with many natural landscapes and historical and cultural relics. You can climb mountains for exercise, enjoy the scenery, and visit Xuanwu Lake, ming tomb and other scenic spots.

3. Xuanwu Lake Scenic Area: Xuanwu Lake is an urban lake in Nanjing, with parks and amusement facilities on the lakeside. You can take a walk, row a boat, play water sports and enjoy the coolness of the lake.

4. Sun Yat-sen Mausoleum: Sun Yat-sen Mausoleum is one of the most important memorial buildings in the modern history of China, and it is also a national AAAAA-level tourist attraction. There are cemeteries, mausoleums, memorial halls and other scenic spots, and you can overlook the whole city of Nanjing.

5. Nanjing ming tomb Scenic Area: ming tomb is the mausoleum of Emperor Zhu Di and Empress Xu of the Ming Dynasty, which belongs to the world cultural heritage. There are tombs, memorial halls and landscape areas, and you can feel the solemnity and beauty of the ancient royal cemetery in China.

In addition to the above scenic spots, there are many other parks, hot springs and lakes in Nanjing for tourists to enjoy in the summer. You can choose the routes and activities that suit you according to your interests and preferences. Of course, in summer travel, we should pay attention to protect ourselves, prevent sun and heatstroke, keep enough water and rest to ensure good health.