I write my best at the beach, I'm at here at the pier
He claims to write his best at the beach, probably because the beach is a calm, outdoor, relaxing place… so he can clear his mind well, therefore his lyrics would be better.
A pier is a structure leading out from the shore into a body of water.
So he’s sitting at the end of a pier, hearing the sounds of water, probably with a nice breeze as well.
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