It's enough to spend a day there. It's not big inside. It could be divided into two large pavilions, an ocean pavilion and a surf pavilion. Go to the aquarium to see various fish, mermaid and dolphin shows. Coming out at midday, we entered the surf room, which has slides, beaches, etc. Just play 2 or 3 hours. Then go out and enter the Happy Valley next door, where you can watch a few foreign shows for half an hour.
Time spent with the group will be tight. If you're not having a good time alone, you'll need to specify what time to return in the afternoon. I didn't leave the museum until 5 p.m. that day.