Cool way to see the canals of Amsterdam AND make a difference. The boat we were on was made of the plastic that was fished out of the canals! Ours had a bottom comprised of plastic bottle tops and cocoa beans (a nod to the sponsor of the boat).
Eric was a great guide with seemingly a deep passion for the cause, experience, and quite a bit of patience for those of us grumbling about the bad weather. We did get soaked by the rain, and fishing out several bags of plastic and other stuff (including 2 chairs and a brand new looking motorcycle helmet), so come prepared for this adventure!
Totally recommended for something different.