Yesterday I saw a fairly large turtle in the middle of the road, who was at great risk of getting hit by a car. I picked him/her up and moved him to the grass and pointed him towards the pond.
Also, someone knocked down a row of those free newsstand/real estate guide/Pennysaver machines a few days ago. No one had stood them back up (except the one that sold the local paper), so I picked them all up to tidy up the neighborhood a little.
A random act of kindness received recently was that a lovely family we don't know left a sweet little Purim basket on our doorstep. I know it was a family because they left a note saying "Happy Purim! From Suri, David, Eva and Adam" and their last name. I still don't know who these people are, but am very touched!