We visited on a weekday during the Obon holiday as a family of four: an elementary school student, a two-year-old, and a couple in their 30s. We had a reservation for 11 AM, made in advance, and went to the reception around 10:45 AM, but due to the crowd, we couldn't enter until 10:55 AM.
The dolphin pool, where the dolphin show is held, has an excellent location, and the building itself is stylish. I was very satisfied with the wide variety of products in the souvenir shop (it's many times larger than the souvenir corner at Kaiyukan). The restrooms were frequently cleaned and hygienic, and I felt at ease knowing that the nursing room clearly stated that men were not allowed.
Even 40 minutes before the dolphin show, many seats were already taken. At the start, many people were standing in the sun. Waiting patiently in a seat outdoors for 40 minutes was very hard on the children, so we went to buy ice cream and drinks midway. It was good that we could eat and drink outdoors.
We sat in the front row for the 1 PM show. For that show, we were in the shade of the roof, but I imagine the evening show would have strong direct sunlight (though I think the location for a sunset dolphin show would be amazing).
Viewing the outdoor tanks in mid-summer was quite hot. There were creative ways to see penguins up close, and feeding events for otters, seals, penguins, and sea lions, but it would be tough without heat countermeasures.
There were a few people in the front row holding parasols to watch the events, which made it difficult for those behind them to see.
There were also events like the pearl extraction experience, a speed lottery where you're guaranteed to win an otter plushie, snow globe making, and all-you-can-stuff figurine bags, which our elementary schooler and toddler thoroughly enjoyed.
There were photo spots both indoors and outdoors, and when it was crowded, there were queues.
At the Setouchi Kitchen restaurant inside the facility, the menu features dishes inspired by dolphins, otters, and hammerhead sharks (around 1000 yen).
However, when we entered around 1:20 PM, many popular items were already sold out.
Our family ordered dolphin curry, a dolphin kids' plate, dolphin shaved ice, a turtle and crab pancake plate, red hammerhead shark negitoro don, and shirasu don (totaling 6230 yen).
The system is that when you purchase meal tickets, the order is automatically sent to the kitchen, and once it's ready, you take your meal ticket to pick up your food.
After eating our main meals, we wanted to have dessert, but since the orders went through simultaneously, we ended up rushing to finish the curry and eating melting shaved ice (tears).
For the pearl extraction event, extracting the pearl itself costs 1000-1200 yen, but processing it into a necklace or keychain costs an additional 3000-4000 yen.
We were told, "If two people participate, it's 1000 yen per person!" so my child and I participated, but since we ultimately processed it into a necklace, the final payment was 8000 yen.
The otter speed lottery on the second floor is recommended because you're guaranteed to win an otter plushie for 1000 or 1500 yen. Even the lowest prize, a 3rd place, is about 40cm. If you're lucky, you can win an extra-large plushie. During our five-hour stay, I saw someone with a large 2nd place plushie, so I feel like the chances are pretty good (we got 3rd place both times).
There was free Wi-Fi available inside the facility, and it worked without any issues. It was stated that we could receive facility information via LINE, but the AI cost 1000 yen and wasn't very helpful.
The total cost, including admission, meals, souvenirs, event participation, and parking fees, was just under 30,000 yen.