Public greenspaces in the slope?

Know of any? Aside from prospect park, of course I ran across one down on 5th ave somewhere...are there others?

Garden of Union/Annie's Garden - Union between 4th and 5th - I passed it the other day on the way back from Tomato & Basil and went in the smaller garden...
http://www.nycgovparks.org/sub_your_park/historical_signs/hs_historical_sign.php?id=11842

You might be interested in this...
http://www.tpl.org/content_documents/nyc_community_gardens.pdf

My front garden.. especially today when this couple just came in past the closed fence and started to take pictures and hang out for a half an hour!! I kid you not! How oblivious to private property can people be?

Rant over.

Now if you want to gang out in my front garden aand have a picnic.. pm me.. and I will invite you... lol