Look toward Tokyo from the Maihama Station platform and you’ll see a giant Ferris wheel. That’s Kasai Rinkai Park — one stop and about 3 minutes away on the JR Keiyo Line, and one of the largest parks in Tokyo. Entry is free. Inside you’ll find Tokyo Sea Life Park, an aquarium where real bluefin tuna school around a doughnut-shaped tank (free for elementary-school kids and under), the 117-meter Diamond and Flower Ferris Wheel, and an artificial beach where kids splash barefoot. Three minutes from the Disney crowds, an entirely different kind of day.

Who is this for?

  • You want a low-key rest day in green space between park visits.
  • Your kids love aquariums — elementary age and under enter free, and adults pay just ¥700.
  • You’d like a Ferris wheel view over Tokyo Bay — with virtually no queue, unlike anything at Disney.
Technically the park is in Edogawa, Tokyo, not Urayasu — but it’s the next station from Maihama, so from any Urayasu or Maihama hotel it might as well be local. Hotel Seaside Edogawa, covered on this site, sits right inside the park.

What to expect

Tokyo Sea Life Park: real tuna in a glass dome

A metropolitan aquarium under a landmark glass dome. The star exhibit is a school of bluefin tuna cruising at speed around a ring-shaped tank — mesmerizing for adults too. Its penguin colony, one of Japan’s largest, swims in an open-air pool you can watch up close. The aquarium is compact enough to finish within a preschooler’s attention span, yet costs only ¥700 for adults and is free for kids 12 and under — metropolitan pricing at its best.

The Diamond and Flower Ferris Wheel: a moving observation deck at 117 m

One of Japan’s largest Ferris wheels, with a ride of about 17 minutes. On clear days you can see the whole of Tokyo Disney Resort, Tokyo Bay, Skytree and even Mt. Fuji. Tickets are ¥800 (ages 3+). Ride it in the late afternoon and you’ll catch the sun setting beyond the parks.

The beach, the bird sanctuary and the great lawn: doing nothing, done right

Cross the footbridge to Nishi-nagisa, a calm artificial beach where local families splash and hunt for crabs in summer. There’s also a bird sanctuary with observation hides and a huge picnic lawn. Bring a bento from a convenience store and the whole day costs you train fare.

The aquarium closes on Wednesdays (or the following day if Wednesday is a national holiday), and the Ferris wheel also takes most of its days off on Wednesdays. The park itself stays open, but if your rest day falls on a Wednesday, both headline attractions may be closed.

Renewal in progress

A brand-new aquarium building is under construction next to the current one as part of a long-term renewal (as of July 2026 the existing aquarium operates normally). Check the official site for the latest status before visiting.

Practical information
Park admission Free (open 24 hours)
Aquarium Adults ¥700, junior high ¥250, elementary age & under free / 9:30–17:00 (entry until 16:00) / closed Wed
Ferris wheel ¥800 (ages 3+) / 10:00–19:00 (until 20:00 Sat, Sun & holidays) / closed mostly on Wednesdays
Address Rinkai-cho 6, Edogawa, Tokyo
Best for Rest day / a sunny morning-to-afternoon

How to get there from Maihama

  1. From Maihama Station, take the JR Keiyo Line one stop toward Tokyo to Kasairinkaikoen Station — about 3 minutes.
  2. The park is directly in front of the station. Walk toward the Ferris wheel and you can’t get lost; the aquarium is about 5 minutes on foot.

From Shin-Urayasu it’s the same line, two stops, about 7 minutes. Door to door, you’re inside the park within 20 minutes of most hotels.

Pair it with

Locals often make it a double-header: a half day here, then Urayasu Traffic Park (free, in Shin-Urayasu). On a rainy day, ride the Keiyo Line a little further to teamLab Planets in Toyosu for an indoor plan B.