Hints:

They are taking a nap.
They won′t mind waking up.
I can′t swim on the land. Won′t they come in the lake?
They are not swimmers.They are not? You are a wonderful swimmer.
Oh, my. And you are the best swimmer of all.
Thank you, Little Bear.
I′d better go now. Good bye.
Bye.
Father Bear.Bye.
Little Bear? What are you doing?
I thought we were supposed to be asleep.
I saw the mermaid.
Oh, really?
I did. I swam with the mermaid.
Oh, sure. Little Bear, you and your mermaid.