Ive been to that park. There is an aquarium right near the station, and after going, I saw the coaster and had to just check the park out. It was seriously ghetto, but the park was nice. Unfortunately, four days before I went, they had had an accident at Mitsui Greenland that closed all the roller coaster in thee country for about a week for "inspections", so I wasn't able to even hop on the coaster. Regardless, it was kind of spooky walking through a park like that and not seeing any other people at all around, it was more deserted than even the other empty parks of Japan.