Visitors are splashed foam while riding a rollercoaster in "Yu-enchi" Spamusement park in Beppu, Oita, Japan Rakutenchi Hot Spring Onsen Theme Park
Credit: The Asahi Shimbun via Getty Images

Japan’s highly anticipated, improbably real, spa-themed amusement park opened in Beppu over the weekend, about eight months after the idea for the project was first announced.

The theme park has all the fantastical, onsen-themed rides the city government first teased out.

The star of the park, obviously, is the hot tub-themed roller coaster, where riders are drenched in soapy foam before going out onto the track. (It's not quite the individual tubs in the teaser video, but we'll take it.) There’s also a merry-go-round made of bathtubs and a carriage ride where guests pedal to move along a track.

When the park opened on Saturday, it had already completely sold out for the day. Those visitors lucky enough to enter were able to walk around in towels and swimsuits before diving into whichever watery ride suits their fancy.

The opening event featured foam dance parties and very long lines.

For some reason, the theme park also features actors who dress up like zombies and parade about the grounds.

The spamusement attraction was brought to life with a combination of contributions from the city and crowdfunding from people around the world.

Beppu, Japan cityscape with hot spring bath houses with rising steam.
Credit: Getty Images/iStockphoto

The park is meant to honor Beppu’s eight natural hot springs (and 2,900 vents), which shroud the city in steam every day. The city is home to the world’s second largest source of thermal spring water, after Yellowstone National Park.