What should I pay attention to when I go to Xiamen?

Xiamen is a coastal city with quite long summers. Be sure to prepare sunscreen when traveling and make plans in advance. For example, Xiamen University needs to make an appointment in advance to visit. We didn't know it at that time, so we didn't make an appointment in advance. It's a pity. It's best to stay in Gulangyu for one night. The night view is really great.