Kaiyukan
Celebrating its 30th anniversary in 2020, this aquarium is located in Osaka. The aquarium, which recreates the natural environment surrounding the Pacific Ocean, is home to a total of 620 species and 30,000 living things.
This is the top aquarium in Asia and it's perfect for bringing kids.
Beppu Onsen
Beppu onsen is the collective name for all of the hot springs across Beppu City in Oita Prefecture. With 2,847 different springs that produce about 130,000 kiloliters of spring water every day, its ranked among the highest of hot springs in Japan. Beppu Onsen is divided into 8 areas and is also called Beppu Hatto or Bappu Onsenkyo. The many different springs offer different water properties and colors, so you won’t want to miss the chance to visit as many different hot springs as possible.
Don't waste your money on the Beppu Jigoku Meguri day pass. The tour is super boring—seeing just one is more than enough.
Tsutenkaku Tower
A steel tower which looks like the Eiffel Tower and 75 meters high was built In 1912, on top of a building which was the motif of the Arc de Triomphe, and named “Tsutenkaku” meaning “A building reaching the heaven'' by Nangaku Fujisawa, a Confucian in the early Meiji period. After being broken down due to a fire, citizens lobbied for rebuilding and the current 2nd Tsutenkaku was built in 1956.
The observation deck is too low, so the view is mostly blocked. There's really not much to see.