One week is enough to stay in Shenzhen, one day to go to Window of the World and one day to Happy Valley. These two places are on both sides of Shennan Avenue and are very close.
Go to Xiaomeisha to see the sea and eat seafood in one day; stay nearby for one night and then go to the OCT in the East for two days!
After that, you can just go shopping at the east gate of Laojie International Trade Center!
You can also go to Kingkey 100 to see the panoramic view of Shenzhen.
If you want to go mountain climbing, only Wutong Mountain can do it!
for reference only!
Tickets for Window of the World and Happy Valley are about 180, OCT in the East for two days and one night is about 400, Xiaomeisha is cheaper at about 25, but if you stay in a hotel, it will be more expensive, you know the sea view room!
Then the ticket for going to Jingji to see the night view is 100.