Best Water Parks In and Around Osaka
Last Updated on August 17, 2025 by Kay
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Let’s face it, Japan in summer is hot, especially in Osaka, so if you need a place to cool down while having fun outside, what better place than a water park?
Thankfully, Osaka and its surrounding area have a multitude of water parks to choose from. In this article, I’ll share the best waterparks in the city as well as those that you can easily travel to.
These water parks are great for all ages, so whether you’re traveling with a group of adults or you’re a parent with kids in tow, you’ll find plenty to keep everyone cool and entertained.
Before you go, be aware that these water parks might be crowded, especially since students are on summer vacation from July to August in Japan.
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The Best Waterparks in Osaka
When it comes to water parks, Osaka has options for every kind of traveler. Here are my top picks. They all include lockers and changing rooms.
Hirakata Park — THE BOON
An amusement park throughout the year, Hirakata Park is somewhere you can easily spend an entire day just going on their rides. And in the summer, they have a hugely popular outdoor water park called THE BOON.
This water park has several pools, including one that lets you lazily float around in a swim ring, a deep pool, a children’s pool with a water playground, several huge water slides (you need to pay 400 yen for some), and a pool where you can see the city below.
⭐️ This is the most adult-friendly water park on my list, so if you want to cool down without feeling like you’ve crashed a kindergarten field trip, this is your spot.
THE BOON is open every day from July 19th to August (except August 28th). In September, it’s only open on the 7th, 13th, 14th, and 15th.
Cost: 2900 yen for adults (ages 13 and up) and 1700 yen for elementary school kids and up (ages 7 to 12), and 1700 yen for kids ages 2 to six. If you want a pass that’ll let you go on rides outside the water park as well (which you can do in your swimwear), it’ll cost double.
Fun Fact: Hirakata Park is one of the oldest amusement parks in Osaka, having opened in 1910!
Hattori Rokuchi Park Water Land
Hattori Rokuchi Park is a beautiful green space located about 15 minutes by train from Osaka Station. It’s lovely throughout the year, but in the summer, they have a wonderful swimming pool that’s especially great for kids.
The pool has a few slides, a flowing pool, as well as a main pool and a pool for young children.
This pool is open from July 19th to the end of August.
Cost: 1050 yen for adults (ages 15 and up), 520 yen for kids (ages 3-14).
Hamadera Park Swimming Pool
Spa World
For an indoor water park experience, consider visiting Spa World.
Spa World is commonly known for its numerous onsen baths with country themes from around the world. However, they also have a water park that is open year-round! (And yes, you can wear, and should wear swimsuits here.)
Spa World’s water park boasts a few water slides, including a steep one that has you descend at a sharp 70-degree angle.
There’s also a pool just for kids ages 12 and under, where older kids and adults who aren’t guardians aren’t allowed. This means your child can play safely without having to worry about bigger kids or adults.
Cost: 2000 yen for adults (ages 13 and up), 1200 yen for kids ages 12 and under. Note that the larger water slides cost 500 yen per ride or 1500 yen for unlimited use, while the kids slide costs 800 yen for all-you-can-slide.
Water Parks Around Osaka
If you’re willing to travel outside the city, or if you happen to live on the outskirts of Osaka, you might want to consider visiting these waterparks.
Tojo Lake Toy Kingdom — Acapulco
Located in neighboring Hyogo prefecture, Tojo Lake Toy Kingdom can be a bit of a journey for people in Osaka. However, if you happen to be somewhat nearby, I highly recommend checking it out.
This amusement park is generally great for small kids because it has a ton of Japanese toys they can play with, but they also have rides, as well as a water park called Acapulco.
Acapulco is for guests of all ages, although unsurprisingly, you will find more kids here than adults. It has several pools, water slides, water playgrounds, and an indoor area with fun inflatable pools for babies and toddlers.
My daughter has so much fun here whenever we visit, and she never wants to leave! According to my daughter, her favorite part of Acapulco is the lazy river, as well as a small pool with a massive bucket that tips over when full and splashes you with water.
Older kids, like my friend’s 13-year-old, will enjoy the huge waterslides, lazy river, and wave pool.
Acapulco opens from July 12th to August 31st, as well as September 6th, 7th, 13th to 15th, 20th, and 21st. Note, though, that like most waterparks in Japan, it is bonkers during summer vacations and the weekend.
Cost: 2400 yen for adults (ages 13 and up), 1900 yen for kids ages two to 12.