Spa Resort Hawaiians
Tohoku, Fukushima · Year-round
Fish Go Round: Japan’s flowing aquarium pool — ~130 m indoor lazy river past tropical fish/tunnels/volcano scenes. Depth ~60–100 cm. Separate waterslides elsewhere in the park.
Indoor option
Indoor / all-weather facilities noted for this stay.
Year-round oriented
Facilities aimed at year-round use (confirm maintenance closures).
family
Gentle float; guardian supervision for kids. Confirm park ticket and age rules on official site.