This interesting abandoned and demolished theme park west of Mt. Fuji has been incorrectly located in quite a few blog posts for some reason. This post even has the incorrect coordinates prominently displayed at the beginning of the article.
I finally found the correct coordinates on this demolished Japanese places (haikyo) list on google: which appears to be created by https://abandonedkansai.com/
35°24'56"N 138°38'55"E
https://tools.wmflabs.org/geohack/geohack.php?params=35_24_56_N_138_38_55_E
It's on the north side of the Fuji Classic Golf Course (富士クラシック): http://fuji.classic.ne.jp/
You can still see the remnants of the park and make out the luge.
(doesn't look like anything to me!)
I finally found the correct coordinates on this demolished Japanese places (haikyo) list on google: which appears to be created by https://abandonedkansai.com/
35°24'56"N 138°38'55"E
https://tools.wmflabs.org/geohack/geohack.php?params=35_24_56_N_138_38_55_E
It's on the north side of the Fuji Classic Golf Course (富士クラシック): http://fuji.classic.ne.jp/
You can still see the remnants of the park and make out the luge.
Google aerial imagery:
Map of the park from this blog post.
Aerial photo rotated to match map:
Another park map: