If you visit Shanghai, you may want to visit nearby city like Hangzhou 杭州. If you have more budget, you won’t want to miss Beijing 北京. Shanghai does not present China. Beijing does. If you want to relax, and really enjoy sea, Sanya 三亚 is the city to go. If you want combined experience of both seashore, and city life, Dalian 大连, Qingdao 青岛 and Xiamen 厦门 are good choices.
Xiamen is warmer than Shanghai.
Xiamen is an island.
Near Xiamen is the Jinmen金门, part of Taiwan island. (Politically important places)
Xiamen is safe.
Xiamen has nice lakes and mountains.
Xiamen is a modern city.
Xiamen has more advanced economy than Fuzhou, the capital of the province, because it became the special development zone 20 years ago.
I love the sea of Xiamen – blue. The sea near Shanghai is yellow.
It is possible to swim in the sea, but not in April.
I like Xiamen.