Hi. I know others have given some great advice.
Picnic areas are great nominations and I see that park seems to have a large picnic area! So I would suggest submitting that as well.
Also, children’s playgrounds if separated from others are eligible. I see the areas seem to be fenced off. While others have told you that you cannot move it, I disagree. You nominated if I can do the translation the “castle playground” which is on the green fenced mat, not the red one. The red mat has the basket swing. So yes, I think it could be moved. Since you placed it outside of the fence of the red fence, while actually not nominating the swing or “children’s park”. You nominated the climbing castle.