On the first morning, I took a bus from Zhongshan Road to Xiamen University and Nanputuo Temple (many bus terminals on Zhongshan Road are Xiamen University). You can eat near Xiamen University at noon. It is recommended to eat in the West Village of Xiamen University, which is opposite the main entrance of Xiamen University and relatively close. After lunch, it is recommended to take a bus back to the hotel to rest, and you can visit Zhongshan Road in the afternoon. Because it is too hot and the sun is too strong outside Xiamen from noon to 5 pm. Have dinner at Zhongshan Road. After dinner, take a ferry to Yefengzhai on Huandao Road, go there to see one country, two systems and ride a bike. Go back to Zhongshan Road to eat snacks in the evening. There is a snack street in Taiwan Province Province on the ferry, which is very authentic.
The next day, you can go to Gulangyu, walk to the ferry from Zhongshan Road Pedestrian Street, and go to Gulangyu by boat. It is recommended to stay in the gallery hotel (the gallery hotel is very popular and generally needs to be booked in advance). It is not recommended to go to those scenic spots in Gulangyu. You can stroll around the island and eat snacks.
On the third day, you can go back to Zhongshan Road, and in the morning, you can go to Guanyin Mountain Dream Coast to play. Go back to Zhongshan Road for lunch and rest. In the afternoon, stroll around the city center. The center of Xiamen is very beautiful. I suggest going to Bailuzhou Park.