I have been to 悠活兒童館. The room is lovely and good. And you could choose which theme of the room from their Web sites. The swimming pool are quite good.
but the beach is not a sand beach for swim. It's a small rocks beach for finding small sea star or crab or creatures. quite interesting. remember to bring boots.
The hotel put some sand on some area inside the hotel for playing.
There are some games for child to play too.
and a session to make bread.
a good hotel for children.
but far away to 墾丁 to eat.