One day is too tight, so it is recommended to go to Dameisha Waterfront Plank Road and Dameisha Beach to see the sea. These two scenic spots are free, and then go to OCT, Hero Valley or Chaxi Valley in the east to buy tickets for sightseeing. In the evening, I went to Paradise Road in Luohu District and ate seafood at a food stall. There are all kinds of seafood, and they are cheap and good. Then, walk to Dongmen Old Street, cross Shennan Avenue from the circular footbridge of the old street, reach Guo Mao and Jinguanghua Business District, and see the night view of Shenzhen. If you hurry, it should be enough. The route is beautiful!