First, you research dolphins until you really understand them. How do they look, act, and sound -- how do they communicate -- how do they get along with humans?
Next, write a good story -- it doesn't matter what subject you write about -- a good story is a good story. Click the link below!
Dolphin
Click on the link below to learn how to write a good horror story!
Anything that you have survived is a good survival story. If you want to write a general story about wilderness survival, anything you are willing to research enough to write will be a good story. You have to be interested enough in something to come up with your own ideas, otherwise it's not going to be a good story.
Here is a good link to the question "What are some tips on writing a good horror story?"
helen keller is a good story
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Why not try writing your own story? You might surprise yourself with how good it is. Think about it.
Write about anything that is interesting to you. If you write about what some anonymous person on the internet thinks is interesting, you'll be bored and your story will be awful.
A boltlenosed dolphin
You have to write your own stories if you're going to be a writer! Think about what you know about good and evil -- if you really can't think of a thing, you're probably not ready to write a story about this subject.
There once was...
You take your time, relax, let go, and have a good idea what your gonna write before you write it. If you get writers block, write anything then continue your story.