That point a is the main entrance. When you go in, turn left when you see the statue of Zhongshan, and then turn right. On the way, you will pass a hundred steps (a long staircase), and then you will see the lake. Opposite the lake is the Science Museum. Walk around the lake. You are instructed to go around on the left, and there is a museum of humanities on the left. This sign is a bell tower.
The school bus will go to the Humanities Museum, but the class time is longer. It takes about 10- 15 minutes to walk by yourself.