I had a great day out yesterday with Seacleaners (sponsored by Watercare in Auckland) and Wilkinson Environmental.

Plastic Pellets
Simon took a lot of photos of small plastic pellets (used in the manufacture of plastic products) that littered the foreshore. Unfortunately we could not clean these up.
Full boat
We loaded up most of the boat in less than an hour or two, we had to stack up the back of the boat to balance the load.
Bottle with black bottom section
I remember these bottles from my childhood, amazing how long it takes for plastic to breakdown.