"One Piece" is one of my favorite shows - but not because of the narrative or script. Basically it follows the typical shonen formula and is filled with fightings and sermonizing on the importance of friendship and being good (That is in spite of the fact that the hero is a pirate...). What makes this series exceptional is the mad and wild visuals. A lot o people are turned off by it's cartoon-y look, buy I LOVE it.
Here are some images of animals from a secluded island shown early in the show (episode 18):
And finally a picture of Zorro - just because he is my fave: