For a city of its size and situation (relatively close to Guangzhou and Taiwan), Xiamen has surprisingly little western-style nightlife. There are a few pubs and discos dotted around the city, notably the Arcadia Disco on Bailuzhou and the bars in the more upscale hotels.
The Night Market here is very popular, bursting with atmosphere and interesting things to buy. The market is located on Ding An Road and takes place every evening between 6 and 10 pm. Get there early to pick up the best bargains!