I say hidden in plain sight because it's quite challenging to actually locate this area on most online maps or described in a distinct way as a destination. It's actually an art walk as part of the Disney Concert Hall, but around its building exterior. By name, it's technically a part of the State of California community parks.
You find it nestled among the facades of the Frank Gehry designed Disney Concert Hall. As you walk up the main entrance steps, stay to your left and just follow the meandering concrete path. One of the first things that will stand out are the unique trees spread throughout. They originate mostly from other countries and are individually marked.
As you continue you'll find a circular design close by. Along its circular, winding line you will find names of contributors. I understand some people will walk this path as part of mental self therapy. Continue walking and you'll find more open space dotted with plants, trees, and art work.
Around the back you will come to a "naked coral tree" with the Disney Hall facade as the background. Almost to the right is the more well known Blue Ribbon Garden and the equally known "A Rose for Lilly" fountain, also designed by Frank Gehry. It's made up of 8000 royal delft china shards. Feel free to throw a lucky coin in. Again, notice the lists of contributors engraved in the floor stones around it.
It's a little gem of a tour you can take on your own for free. Actually, there's a video self tour on the web that visually walks you through all this. However, it's best seeing and experiencing in real person. It's a nice treat one can enjoy while visiting all the other major museums in the Art District of L.A.