Not sure how that happened. It's now fixed. Thanks for pointing this out!

Based on my understanding of how OSM tags "parks" vs "nature_reserves", I would think that Rush Creek falls more into a "nature reserve". Parks, as defined by OSM are open green areas maintained by a government. A "nature reserve" is a protected area for conservation. Rush Creek definitely is not an open, maintained, green space. It's an area that is mostly left to do its natural thing.

Am I misunderstanding the definitions?

It is just the building. I'll go ahead and add it there.

Thanks!

It is just a private residence. Would having a named "point" be good enough? Or would it be better to name the shape?

No. It is not a real castle even though it is referred to as such. I don't recall deliberately tagging this place as a castle. I'll remove the tag.

I'd like to redo this modification but I don't know how to remove it. It should be a park that matches the road segments with a playground in the middle.