Hi Rage
I went on a summer vacation to Okinawa in Japan. The Aquarium is called the Churaumi Aquarium. The facility itself might be a bit underwhelming, because of the shear size of the main aquarium. It's along the west coast, so it shouldn't be to tough to reach, because the highway from the main city Naha only goes along the western coastline.
You can also she a LOT of golden silk orb-weaver spiders everywhere on the island. I got about 20 pictures within a 3 day period to traumatize my good friend with.
They also have a one or two snake parks around the island, but didn't check it out, because of a limited time schedule, but pamphlets often included a add for the parks.
Regards Anders