I work driving water taxis on Queen Charlotte Sound in NZ. You may be able to spot a couple of houses in the photo. They are boat access only and there are about 500 on the sound. Its wintertime at the moment and although its pretty cold and quiet we have some lovely days out on the water.
I took this hanging over the back of the boat with my camera way too close to the water. Took a few shots to get the timing right and make we sure we weren't going to crash at the same time. I had to clean dolphin breath off the front of the lens a couple of times!
F7.1
1/320
ISO200
This happy little dolphin is a Bottlenose (Tersiops truncatus). I have more photos of dolphins if anyone wants to see, let me know in comments.