Welcome @Irotokim to this forum.
It can be confusing when you get rejections for a nomination and appeal and the responses are not clear as to why your submission hasn’t been successful.
I think the comments so far have covered the most likely reasons.
So shifting to consider other options is a good idea.
Can you post a picture of the potential picnic area? Picnic areas are good places to socialise. There are also benches.
What are the adjacent buildings?
Or can you say where this is.
We will be happy to help with suggestions of what to include. @cyndiepooh advice about some background research, is something that is often needed if a submission is not that strong.
This contains lots of useful advice about creating a good submission.