There is going to be a Trash Bash to clean up Little Thicket Park on Saturday March 29, 2008. It is located just west of Ella at the end of W 23rd St.
I went hiking around the park this past weekend and it has a ton of potential, but has a lot of trash scattered throughout it right now. With a little cleanup, the park could be a really great natural area to go hike around, etc. It is also an official nature sanctuary for migratory birds (if that is something you are into). I've seen plans for the park to have a complete "hike & bike" overhaul, but don't know if that is still in the works or not.
The cleanup effort has the support of the Shady Acres Civic Club, but will need help from anyone who is willing to pitch in. More information can be found at the following links:
http://www.trashbash.org/site_little_thicket.html
http://www.shadyacres.org/index.php?topic=34.0