I joined a puffin tour from Reykjavík this summer, with the company Elding. I was glad to note that they seemed very conscious about their impact on the puffin colonies, for example they only go out to the puffin islands with small boats now, not the larger whale watching vessels. The engine was turned off when we arrived by the islands, and we just drifted along, watching the busy (and, funnily enough, quite clumsy-looking) puffins. Good times! :-)

Puffin (Fratercula arctica)

Nikon D7000 + Nikkor 70-300mm f/4.5-5.6
Processed in UFRaw/Gimp