For scenic spots, it is recommended to visit OCT Grand Canyon or Chaxi Valley. These two are paid scenic spots, and I personally recommend the Grand Canyon.
If the park is free, Shenzhen Talent Park is recommended. You can see the panoramic view of Houhai CBD. In addition, it is connected with Hongshuwan leisure belt. You can take a walk to Hongshuwan by the way. The location is very good.
I have travel notes for both of them, so I can have a look.