Travel advice:
Day 1: Visit Civic Center, Lotus Hill, Shenzhen Library and Shenzhen Museum. If you still have time, you can go to the Convention and Exhibition Center.
Day 2: Go to Yantian District and visit Dameisha Waterfront Park and xiaomeisha Ocean World.
Day 3: Visit Shenzhen Bay Park (including Window of the World and Folk Village) in OCT East.
Day 4: Visit Dapeng Peninsula (Yangmeikeng Valley Valley, Luzui Mountain Villa, Dapeng Lock City, Jiaochangwei)