Nesta Resort Kobe

Kansai, Hyogo
Outdoor 150 m lazy river plus dump-bucket water fort and a large slide lineup. Indoor kids pool with slides is separate (not the lazy river).
Outdoor spaces
Outdoor areas listed — check season and weather.
family
Lazy river is mixed-age; thrill slides have 100–120 cm+ and weight limits. Kids under elementary need adults.
Official confirmation
Hours and fees change — verify on the official site.