The "nature" concept, especially with the revisions laid out here is the strongest concept. Though I found this little tidbit of feedback from the city to be a bit... humorous...
"Some cultural groups do not access nature the same way as others, feeling unwelcomed and unsafe in dark, wooded spaces"
First, I am not sure what cultural group they are referring to. Secondly, whomever these people are, it must be challenging living in the northwest while being afraid of trees...
Regardless of which approach is taken, there is most likely going to be quite a bit of issues with vagrants at this location. Especially with so much open space. The blocks adjacent to Bud Clark Commons (and all of Oldtown) have become pretty gnarly. The city so far has done very little to keep tabs on the problem in the park blocks adjacent to this site, which does leave me a bit concerned with how it will be handled here. It's really a shame, the park block are so lovely but I tend to avoid them as I often have been hassled for sitting in or passing through the area by members of the homeless community posting up there.