What is the best thing to do when you arrive at guangzhou past mid night?

The best thing maybe to enjoy some high time in the pubs or bars, but considering you are going to take a train in the next morning, you are suggested to find a hotel near the railway station to have a good rest.

Near the train station, there are some cheap hotels available, but the condition of them may not be pleasant.

Jinyuan Youth Hostel, located at No. 87 of Zhanxi Road.
Tiantianlai Hotel, located at No. 87 of Zhanxi Road.
Shenghao Hotel, located at No. 2 of Zoumagang, Sanyuanli.
Well, at Zhanxi Road, there are many other cheap hotels, you can have a try.