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They're extremely social, and dolphins within a locale tend to have a dialect for their communication. That is, dolphins which are geographically isolated talk to each other differently. Their language is partially learned, not instinctual.
They understand quantity and category, they understand a mirror is reflecting their own image, they make games to play among themselves, they problem solve on he same level nonhuman primates do, and they get bored really easily and will kill themselves if you isolate them for a few months. They're pretty damn smart as far as animals go. They'd probably make a shitty written language if they had any method of writing.
Also they're very attractive and extremely lewd. Don't lie, you'd fuck a dolphin. They're clearly the most superior marine organism and your dick knows it.