The three-day tour in Shenzhen can be arranged as follows:
Day 1: East OCT-Old Street-Wang Di Mansion. Wang Di Tower has a history of 20 years now, and I am not the tallest building in Shenzhen, but it is still a landmark of Shenzhen, and it is a place worth punching in.
Day 2: Window of the World-Shenzhen Bay Park-Mangrove. Window of the World is the epitome of foreign architecture, and it is also suitable for taking pictures.
Day 3: You can go boating in Happy Valley or China Folk Village. Sailing is also fun. Close to the sea. Just make a reservation on the small program boat.