The Civilization and Scenario Pack: Polynesia DLC for Civilization V
contains one civilization, which I have played, and one scenario which I have not played yet. I'll get back to you on that one.
Anyway. Polynesia here is a conglomeration of multiple South Pacific cultures, so it's only right and proper that they're one of the most powerful culture civilizations in the game. Their unique Moai improvement lets players generate boatloads of culture (and later, tourism) with skillful settlement and placement.
Meanwhile, their unique ability lets them cross oceans right from the beginning to get the first and best pick of new lands, with their unique unit - a Warrior replacement - letting them conquer and defend colonies from barbarians. It goes without saying that Polynesia benefits the most from Small Continents and Archipelago maps, but thanks to their ocean-crossing ability, playing Polynesia on a Terra map is guaranteed to be entertaining as well. For you, anyway.
It helps that Kamehameha is generally awesome - except if you're going culture in the same game he's in, I suppose - and the unique outrigger canoe graphic for embarked units is nice too.
For a Civ V DLC, I'd say this is pretty decent value overall. Recommended if you didn't get the complete pack.