Seeing the similarity between Arlong Park and Sabaondy Park reminded me of Michael Jacksons Neverland Ranch http://mappery.com/maps/Michael-Jacksons-Neverland-Ranch-Map.jpg
Here's why: Both didn't have a happy, traditional childhood. Michael Jackson, because he was put on stage when he was barely 6 years old plus he was regularly abused by his father. Arlong, because he suffered discrimination at the hands of humans throughout his life. Now, when both were rich and powerful, they tried to recreate something that they never had, a proper childhood. Jackson did so by building his own amusement park, that he named after Peter Pan's island and where he surrounded himself with children, Arlong, by recreating the place he so desired to visit as a child.
Not to say that Arlong was completely faultless, but this made me understand him a bit better.